JP4481769B2 - Disc brake - Google Patents

Description

  The present invention relates to a disc brake that is preferably used to give a braking force to a vehicle or the like, for example.

  In general, a disc brake includes a mounting member attached to a non-rotating portion of a vehicle, a caliper that is slidably supported by the mounting member via a slide pin, and a pair of calipers pressed against both sides of the disc. A friction pad is generally used (see, for example, Patent Document 1).

JP 2001-153160 A

  In this type of conventional disc brake, for example, a mounting member is provided with a pin sliding hole, and a sliding pin attached to the caliper is slidably inserted into the pin sliding hole. When the brake is operated, the caliper slides in the axial direction together with the slide pin, thereby pressing the friction pad against the disk.

  Further, the mounting member is provided with a boot mounting hole by expanding the diameter of the opening side of the pin sliding hole, and this boot mounting hole is formed as a stepped hole in which the back side is an increased diameter portion. . And, between the boot mounting hole and the sliding pin, a protective boot formed in a cylindrical shape by an elastic material such as rubber is provided, and this protective boot is a sliding surface between the pin sliding hole and the sliding pin. It is the structure which protects.

  In this case, the protective boot includes an expansion / contraction portion that is inserted into the outer peripheral side of the sliding pin so as to be expandable / contractable in the axial direction, an attachment cylinder portion formed on one side of the expansion / contraction portion in the axial direction, It is formed by projecting outward in the radial direction from one side in the direction, and an annular flange having an outer diameter larger than the hole diameter of the boot mounting hole. And the annular collar part is fitted in the diameter-expanded part of the boot attachment hole in the retaining state.

  At the time of assembling the disc brake configured as described above, for example, an assembling work of the protective boot is performed using an automatic assembling machine or the like. In this case, the automatic assembling machine first arranges the protective boot and the boot mounting hole coaxially, and then presses the protective boot against the opening side of the boot mounting hole with a predetermined load, stroke, and the like, for example.

  As a result, the annular flange portion of the protective boot is pushed into the boot mounting hole while elastically deforming in the diameter reducing direction, and returns to its original shape when entering the enlarged diameter portion on the back side. As a result, since the annular flange is fitted in the boot mounting hole in a retaining state, the protective boot can be assembled to the boot mounting hole.

  In this case, in the prior art, for example, a lubricant (assembly liquid) or the like may be applied to the opening side of the boot mounting hole so that the protective boot can easily slide into the boot mounting hole.

  By the way, in the above-described prior art, when the assembling work of the protective boot is performed, the center axis of the protective boot and the boot mounting hole may rarely be displaced. In this state, when the protective boot is pressed against the mounting hole, the protective boot is crushed between the automatic assembly machine and the mounting member before it is elastically deformed and enters the boot mounting hole. It may be distorted and assembly of protective boots may fail.

  For this reason, in the disc brake production line, etc., it is easy to cause improper installation of protective boots, and each time the automatic assembling machine is stopped to stop the assembling work or the assembling becomes inappropriate. Therefore, it is necessary to reassemble the protective boot in an extra process, and there is a problem that work efficiency is lowered.

  In addition, in order to avoid improper assembly of the boot, for example, the protective boot and the boot mounting hole are aligned with high accuracy, and the amount of lubricant applied to the periphery of the boot mounting hole, the application state, etc. are accurately determined. It becomes necessary to manage, and these operations are also time-consuming and productivity is lowered.

  Furthermore, if the position of the protective boot is likely to shift, for example, when setting the load, stroke, etc. of the automatic assembling machine, it is necessary to find an appropriate setting that can compensate for the position shift. .

  On the other hand, in the assembling work of the protective boot, it is necessary to apply a relatively large pressing force to the protective boot at the initial stage of the assembling, and to elastically deform the annular flange portion and push it into the boot mounting hole. However, when the protective boot is pressed with a large force, even if it is arranged coaxially with the boot mounting hole, the boot is distorted at a certain rate, and the same problem as when the protective boot is displaced is caused. appear.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to stably attach a protective boot using, for example, an automatic assembling machine and prevent improper assembly. Another object of the present invention is to provide a disc brake capable of improving work efficiency when assembling boots and improving productivity.

  Another object of the present invention is to apply a pressing force of an automatic assembling machine or the like to the boot in a state in which the protective boot is hardly distorted, and to stably push the annular flange into the boot mounting hole. It is to provide such a disc brake.

  In order to solve the above-described problem, the present invention provides an attachment member attached to a non-rotating portion of a vehicle and slidably supporting a caliper via a slide pin, and either one of the attachment member and the caliper. A pin sliding hole provided in the member, into which the sliding pin is slidably fitted, a boot mounting hole formed by expanding the opening side of the pin sliding hole, and the pin sliding hole In order to protect the sliding surface between the sliding pin and the sliding pin, a disc brake having a cylindrical protective boot with one axial side fitted into the boot mounting hole and the other axial side attached to the outer peripheral side of the sliding pin Applied.

  A feature of the configuration adopted by the invention of claim 1 is that the protective boot is formed on the outer peripheral side of the sliding pin so as to be extendable in the axial direction, and on one side in the axial direction of the elastic portion. The mounting tube portion and an annular flange portion that protrudes radially outward from one axial direction of the mounting tube portion, and the boot mounting hole is formed with a smaller diameter than the annular flange portion of the protective boot. A tube fitting portion to which the mounting tube portion is fitted, a flange fitting portion formed by expanding the diameter on the back side of the tube fitting portion and fitted with an annular flange, and a tube portion A stepped portion that is located on the opening side of the fitting portion and is formed in a stepped shape with a hole diameter substantially equal to the outer diameter of the annular flange portion and guiding the annular flange portion toward the tubular portion fitting portion. This is because it is constituted by a guide portion.

  According to the second aspect of the present invention, the stepped guide portion of the boot mounting hole is opened on the surface of one member with a diameter larger than that of the annular flange, and is reduced in diameter to a substantially conical shape toward the back side. An opening-side groove portion, a constant-diameter groove portion that communicates with the depth side of the opening-side groove portion and has a hole diameter substantially equal to the outer diameter of the annular flange portion of the protective boot, and extends coaxially with the tubular portion fitting portion; It is comprised by the back side groove part which diameter-reduces to a substantially cone shape from the back side of this, and is connected to a cylinder part fitting part.

On the other hand, according to the invention of claim 3, the protective boot is formed on the outer peripheral side of the sliding pin so as to be extendable in the axial direction, and is formed on one side in the axial direction of the expansion / contraction part and has a length in the axial direction. It has extended Rutotomoni, a mounting cylinder portion having a chamfered portion whose diameter is reduced toward the one axial side to the one axial end portion, radially outward in the axial direction of the intermediate position of the mounting cylindrical portion constituted by an annular flange portion formed to protrude, the boot mounting hole, a cylindrical fitting portion where the mounting cylinder portion is formed smaller in diameter is fitted the annular flange portion of the protective boot, tubular a flange portion fitting portion intermediate position diametrically enlarged formed in the annular flange portion of the length direction of the part fitting portion is fitted, is formed on the opening side of the tubular fitting portion the mounting cylinder portion the chamfered portion is constituted by a guide portion for guiding toward the tubular fitting portion.

  According to the invention of claim 4, the mounting cylinder part of the protective boot is configured to have an outer diameter substantially equal to the hole diameter of the cylinder fitting part of the boot mounting hole.

  According to the first aspect of the present invention, the stepped guide portion having a hole diameter larger than that of the tubular portion fitting portion and having the same diameter as the annular flange portion of the protective boot is provided on the opening side of the boot mounting hole. It can be arranged. Thus, in the assembling work of the protective boot, if the annular flange is pressed against the opening side of the boot mounting hole, the annular flange enters the stepped guide portion without elastic deformation in the diameter reducing direction. Can be smoothly inserted into the stepped guide portion while preventing distortion due to the reaction force of elastic deformation.

  As a result, since the annular flange can be fitted to the stepped guide part with almost no gap, even if the protective boot is displaced in the radial direction with respect to the tubular part fitting part of the boot mounting hole. These axis lines can be accurately matched by the stepped guide portion, and the protective boot and the tube portion fitting portion can be easily aligned.

  When the protective boot is pressed in this state, for example, the stepped guide portion can elastically deform the annular flange portion in the diameter-reducing direction, and can smoothly guide this toward the small-diameter tube portion fitting portion. The collar portion can be stably pushed into the tube portion fitting portion. Thereby, an annular collar part can be fitted in the collar part fitting part of a boot attachment hole, and a protection boot can be assembled | attached reliably to a boot attachment hole.

  Therefore, in a disc brake production line or the like, it is possible to prevent improper assembly due to the displacement of the protective boot or the like, and the assembly work can be performed efficiently. In addition, for example, it is not necessary to excessively increase the alignment accuracy of the protective boot by an automatic assembly machine or the like, and it is not necessary to strictly control the amount of lubricant applied around the boot mounting hole. Therefore, productivity can be improved by a low-cost method by simply changing the shape of the boot mounting hole.

  Furthermore, since it is possible to prevent displacement of the protective boot, for example, when setting the load, stroke, etc. of the automatic assembly machine, it is not necessary to consider the case where displacement occurs, and these settings can be easily performed. . Further, for example, a load judgment value for judging improper assembly of boots can be easily set, and the automatic assembly machine can be handled smoothly.

  According to the invention of claim 2, the outer diameter on the opening side of the stepped guide portion can be increased by the substantially conical opening side groove portion. Thus, even when the protective boot is displaced, the annular flange can be reliably inserted into the opening-side groove, and the annular flange is smoothly guided toward the equal-diameter groove by the substantially conical opening-side groove. can do.

  Moreover, since the equal-diameter groove portion has a certain axial dimension, the annular flange portion of the protective boot can be stably fitted to the equal-diameter groove portion, and the boot can be aligned with certainty. . And this annular collar part can be smoothly guided toward a cylinder part fitting part, reducing a diameter uniformly over a perimeter by the substantially conical back side groove part.

On the other hand, according to invention of Claim 3, the annular collar part of a protection boot can be arrange | positioned in the intermediate position of the axial direction of a mounting cylinder part (the middle position away from the both ends of an axial direction). As a result, when assembling the protective boot into the boot mounting hole, before the annular collar portion is elastically deformed with a large pressing force and pushed into the tube fitting portion, a part of the mounting tube portion is first removed from the chamfered portion side. It can be inserted into the tube fitting portion with a relatively small pressing force.

  And, when the annular flange is pushed into the tube fitting portion, the axial length of the portion receiving the pressing force in the protective boot may be shortened by the portion previously inserted in the tube fitting portion. it can. As a result, the pressure-receiving portion of the protective boot can be formed into a short shape that is not easily distorted with respect to the axial pressing force, and unexpected distortion can be prevented from occurring in the boot due to the pressing force during assembly. .

  In this way, at the initial stage of the assembly work, it is not necessary to apply a large pressing force to the protective boot that is easily distorted, and only when the annular flange portion of the boot is pushed into the tube fitting portion, it is difficult to distort. Since it is sufficient to apply a large pressing force to the formed protective boot, the annular flange can be stably fitted to the flange fitting portion while preventing the boot from being distorted throughout the assembly work.

In addition, since the guide portion is provided on the opening side of the boot mounting hole, the chamfered portion of the mounting tube portion is cylinder- driven by the guide portion even in a state where the protective boot is displaced in the radial direction at the initial stage of assembly work. The guide can be smoothly guided into the portion fitting portion, and the protective boot and the tube portion fitting portion can be aligned coaxially.

  Therefore, in the brake production line, etc., it is possible to prevent improper assembly from occurring due to, for example, the setting state of the load (pressing force) of the automatic assembly machine, the displacement of the protective boot, etc. Can be performed efficiently. As a result, it is not necessary to strictly manage the alignment accuracy of the protective boot, the amount of lubricant applied, etc., as in the case of the invention of claim 1, and the load, stroke, etc. of the automatic assembly machine can be easily achieved. Since it can be set, productivity can be improved by simplifying the work process.

  Furthermore, according to the invention of claim 4, the outer diameter of the mounting cylinder portion can be formed substantially equal to the hole diameter of the cylinder portion fitting portion. As a result, in the assembling work of the protective boot, even if the pressing force is relatively small, it can be smoothly inserted into the cylindrical portion fitting portion without causing the elastic deformation of the mounting cylindrical portion. And the boot mounting hole can be accurately aligned with each other.

  Hereinafter, a disc brake according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  Here, FIGS. 1 to 8 show a first embodiment, and in this embodiment, a disk brake mounted on a vehicle such as an automobile will be described as an example.

  Reference numeral 1 denotes an attachment member constituting a base portion of the disc brake. The attachment member 1 is integrally attached to a non-rotating portion (not shown) of the vehicle on the inner side of the disc D that rotates together with the wheels.

  Here, the mounting member 1 has a pair of arms 1A, 1A that are separated in the circumferential direction of the disk D and extend in the axial direction so as to straddle the outer circumferential side of the disk D. As shown in FIG. 2, a pin sliding hole 4 and a boot mounting hole 8 which will be described later are provided. The pin sliding hole 4 and the boot mounting hole 8 constitute a stepped bottomed hole that opens to the end face 1B of the arm portion 1A as a whole, and are formed coaxially about the axis O1-O1. .

  A caliper 2 is slidably supported by the mounting member 1 via a slide pin 5 which will be described later. The caliper 2 includes an inner leg 2A arranged on the inner side of the disk D as shown in FIG. A bridge portion 2B extending from the inner leg portion 2A to the outer side so as to straddle the outer peripheral side of the disc D, and extending radially inward from the distal end side of the bridge portion 2B and disposed on the outer side of the disc D The outer leg portion 2C and two pin mounting portions 2D projecting from the inner leg portion 2A on both sides are constituted.

  Reference numeral 3 denotes a pair of friction pads located on both sides of the disk D and provided between the arm portions 1A of the mounting member 1. The friction pads 3 are arranged in the axial direction of the disk D between the arm portions 1A. It is slidable. The friction pad 3 is pressed against both sides of the disk D by the caliper 2 when the brake is operated, thereby applying a braking force to the disk D.

  Reference numeral 4 denotes a pair of pin sliding holes (only one is shown) provided in each arm portion 1A of the mounting member 1. Each pin sliding hole 4 is a circular hole with a bottom centered on the axis O1-O1. Is formed to guide a sliding pin 5 described later in the axial direction.

  Reference numeral 5 denotes a sliding pin provided in each pin mounting portion 2D of the caliper 2, and each sliding pin 5 is fixed to the pin mounting portion 2D by a pin bolt 6 on the base end side. The distal end side of the sliding pin 5 is inserted into the pin sliding hole 4 of the mounting member 1 and can slide in the axial direction within the pin sliding hole 4. Further, on the outer peripheral side of the sliding pin 5, an annular boot mounting groove 5A to which a protective boot 7 described later is mounted is provided.

  7 is a protective boot provided between each arm portion 1A of the mounting member 1 and the sliding pin 5, and each protective boot 7 is made of an elastic material such as rubber as shown in FIGS. It is formed as a bellows-like cylindrical body centered on the axis O 2 -O 2 and protects the sliding surfaces of the pin sliding hole 4 and the sliding pin 5.

  Here, the protective boot 7 includes a bellows-like expansion / contraction portion 7A that is inserted in the axial direction on the outer peripheral side of the sliding pin 5 and a mounting cylinder integrally formed on one side in the axial direction of the expansion / contraction portion 7A. 7B, an annular flange 7C projecting radially outward from one side of the mounting cylinder 7B and having a predetermined outer diameter A, and radially outward from the other axial side of the mounting cylinder 7B And an annular skirt portion 7D formed so as to protrude in the direction.

  The protective boot 7 has an attachment cylinder portion 7B and an annular flange portion 7C attached in a boot attachment hole 8 which will be described later, and the other axial side of the expansion / contraction portion 7A is attached to the boot attachment groove 5A of the sliding pin 5. Yes. Further, the mounting cylinder portion 7B is elastically slidably contacted with the outer peripheral side of the sliding pin 5 while being fitted in the cylindrical portion fitting portion 9 of the boot mounting hole 8, thereby This prevents the sliding pin 5 from rattling.

  Further, when a braking torque is applied from the disk D to the caliper 2 during the operation of the brake, the sliding pin 5 may be slightly tilted with respect to the axis O1-O1 in the pin sliding hole 4 due to the braking torque. In this case, the mounting cylinder portion 7B is configured to elastically deform following the sliding pin 5 to allow the inclination to some extent and to suppress galling between the mounting member 1 and the sliding pin 5.

  On the other hand, as shown in FIGS. 7 and 8, the annular flange portion 7 </ b> C is pushed into the tube fitting portion 9 of the boot mounting hole 8 while being elastically deformed in the reduced diameter direction. It is fitted in the collar fitting part 10 via the part 9 in a retaining state. In this state, the skirt portion 7D elastically contacts the end surface 1B of the mounting member 1 over the entire circumference on the outer side in the radial direction of the stepped guide portion 11 described later, and closes the pin sliding hole 4 and the boot mounting hole 8. In addition, these holes are protected from foreign matters such as dust and moisture.

  Reference numeral 8 denotes a boot mounting hole provided in each arm portion 1A of the mounting member 1, and each boot mounting hole 8 has an enlarged diameter on the opening side of the pin sliding hole 4 as shown in FIGS. Thus, a circular stepped hole is formed in the end surface 1B of the arm 1A, and the back side communicates with the pin sliding hole 4. The boot mounting hole 8 is constituted by a cylinder fitting portion 9, a flange fitting portion 10 and a stepped guide portion 11 which will be described later, and these portions are formed coaxially with each other about the axis O1-O1. Yes.

  Reference numeral 9 denotes a cylindrical portion fitting portion that constitutes an axial intermediate portion of the boot mounting hole 8, and the cylindrical portion fitting portion 9 is formed in a cylindrical shape extending in the axial direction with a constant hole diameter D1, inside thereof. The mounting cylinder 7B of the protective boot 7 is fitted. Further, the hole diameter D1 of the tube fitting portion 9 is formed smaller than the outer diameter A of the annular flange portion 7C of the protective boot 7 as shown in FIG.

  Reference numeral 10 denotes a flange fitting portion formed by expanding the diameter to the back side (one side in the axial direction) of the tube fitting portion 9, and the flange fitting portion 10 includes a pin fitting portion 9 and a pin It is arrange | positioned between the sliding holes 4, and has a hole diameter D2 larger than the hole diameter D1 of the cylinder part fitting part 9 (D2> D1). And in the collar part fitting part 10, the annular collar part 7C of the protective boot 7 is fitted in the retaining state.

  11 is a stepped guide portion provided on the opening side (the other side in the axial direction) of the tube portion fitting portion 9, and the stepped guide portion 11 has an annular portion in the middle of the axial direction (axial direction O 1 -O 1 direction). It is formed with a hole diameter substantially equal to the outer diameter A of the portion 7 </ b> C, and is expanded in a stepped shape from the tubular portion fitting portion 9 toward the end surface 1 </ b> B of the mounting member 1. Then, the stepped guide portion 11 guides the annular flange portion 7C toward the tube portion fitting portion 9 when the assembling work of the protection boot 7 is performed, and the protection boot 7 is coaxial with the tube portion fitting portion 9. To align with.

  Here, the stepped guide portion 11 is open to the end surface 1B of the mounting member 1 and communicates with the opening side groove portion 11A that is reduced in diameter in a substantially conical shape toward the depth side, and the depth side of the opening side groove portion 11A. A cylindrical equal-diameter groove portion 11B extending coaxially with the tubular portion fitting portion 9 and a deep-side groove portion that is reduced in diameter from the depth side of the constant-diameter groove portion 11B to a substantially conical shape and communicates with the tubular portion fitting portion 9. 11C.

  In this case, the opening-side groove portion 11A is formed such that the hole diameter D3 of the opening end is larger than the outer diameter A of the annular flange portion 7C of the protective boot 7 (D3> A). As a result, when the protective boot 7 is assembled, as shown in FIGS. 4 and 5, even if the axis O2-O2 is slightly displaced from the axis O1-O1 of the boot mounting hole 8, the annular collar 7C Can be reliably inserted into the opening-side groove 11A. Since the opening-side groove portion 11A has an inclined surface that is tapered in diameter, the annular flange portion 7C can be smoothly guided toward the equal-diameter groove portion 11B by the inclined surface.

  The equal-diameter groove portion 11B has a constant hole diameter D4 over the entire length L in the axial direction, and this hole diameter D4 is set to be substantially equal to the outer diameter A of the annular flange portion 7C as shown in the following equation (1). In addition, it is formed to be larger than the hole diameter D1 of the tube portion fitting portion 9.

  Thereby, as shown in FIG. 6, the annular flange portion 7 </ b> C can enter the substantially equal-diameter groove portion 11 </ b> B without elastic deformation in the reduced diameter direction. For this reason, it is possible to prevent the protective boot 7 from being distorted due to a reaction force or the like when the annular flange portion 7C is elastically deformed, and while holding the protective boot 7 in an undistorted state, the annular flange portion 7C Can be inserted smoothly. Since the annular flange portion 7C is fitted in the equal diameter groove portion 11B with almost no gap, the axis O2-O2 of the protective boot 7 is set to the axis O1-O1 of the tube portion fitting portion 9 and the like. Accurate alignment is possible.

  Furthermore, the back side groove portion 11 </ b> C is an inclined surface that is reduced in diameter in a taper shape from the equal diameter groove portion 11 </ b> B toward the tube portion fitting portion 9. For this reason, 11 C of back side groove parts can guide this smoothly toward the cylinder part fitting part 9, reducing the diameter of the annular collar part 7C uniformly over the perimeter.

  On the other hand, an annular gap is formed by the stepped guide portion 11 on the outer peripheral side of the mounting cylinder portion 7B of the protective boot 7 as shown in FIG. For this reason, even if the sliding pin 5 is inclined with respect to the axis O1-O1 in the pin sliding hole 4 due to, for example, braking torque transmitted from the disk D, the mounting cylinder portion 7B follows the sliding pin 5. It can be easily elastically deformed in the surrounding gap.

  Thereby, since the clearance allowance when the mounting cylinder part 7B is elastically deformed by the clearance in the stepped guide part 11 can be secured, when the sliding pin 5 is inclined, the sliding pin 5 and the mounting cylinder part 7B It is possible to prevent the sliding resistance from increasing between the two, and to maintain these slidability satisfactorily.

  The disc brake according to the present embodiment has the above-described configuration. Next, referring to FIGS. 3 to 8, for example, an automatic assembling machine (not shown) is used on the brake production line. The assembling work of the protective boot 7 will be described.

  In this assembling work, as shown in FIG. 3, the automatic assembling machine first sets the protective boot 7 and the boot mounting hole 8 of the mounting member 1 at the mounting position, and after these are arranged coaxially, The protective boot 7 is pressed against the opening side of the boot mounting hole 8 with a predetermined load and stroke.

  In this case, when the protective boot 7 and the boot mounting hole 8 are set at the assembly position, they may rarely be displaced as shown in FIG. In this state, since the axis O2-O2 of the protective boot 7 is disengaged from the axis O1-O1 of the boot mounting hole 8, when the two are pressed by the automatic assembling machine, the annular flange 7C is elastically deformed to attach the boot. Before entering the hole 8, the protective boot 7 may be crushed and distorted into an unexpected shape, as indicated by a virtual line in FIG. 5.

  However, in the present embodiment, the stepped guide portion 11 is provided on the opening side of the boot mounting hole 8. For this reason, as shown by the solid line in FIG. 5, the annular flange portion 7 </ b> C of the protective boot 7 extends along the opening-side groove portion 11 </ b> A of the stepped guide portion 11 even when pressed against the boot mounting hole 8 in a misaligned state. Then, it is guided into the equal diameter groove portion 11B and enters the equal diameter groove portion 11B without elastic deformation as shown in FIG.

  As a result, the protective boot 7 is aligned coaxially with the tubular portion fitting portion 9 by the equal-diameter groove portion 11B while maintaining a free state shape without receiving a reaction force due to elastic deformation from the mounting member 1 side. It becomes the state.

  When the protective boot 7 is pressed in this state, the annular flange portion 7C is uniformly reduced in diameter by elastically deforming along the back side groove portion 11C of the stepped guide portion 11, and as shown in FIG. It is pushed into the tube portion fitting portion 9. Therefore, by further pressing the protective boot 7, the annular flange 7C can be made to enter the flange fitting part 10 from the tube fitting part 9, and the annular collar 7C returns to its original shape at this position. By doing so, as shown in FIG. 8, the protective boot 7 can be assembled to the boot mounting hole 8 in a retaining state.

  Next, the operation of the disc brake will be described. First, when the brake is operated while the vehicle is running, the brake fluid pressure is applied to a piston (not shown) inserted into the inner leg 2A of the caliper 2. As a result, the piston presses the inner friction pad 3 against the disk D. At this time, the caliper 2 slides and displaces to the outer side due to the reaction force at the time of pressing, and the outer leg 2C presses the friction pad 3 on the outer side against the disk D, so that braking force is applied to both sides of the disk. Can do.

  Thus, according to the present embodiment, the boot mounting hole 8 is configured by the tube portion fitting portion 9, the flange portion fitting portion 10 and the stepped guide portion 11, and therefore, on the opening side of the boot mounting hole 8, A stepped guide portion 11 having a hole diameter D4 larger than the hole diameter D1 of the tube fitting portion 9 and having substantially the same diameter as the annular flange portion 7C of the protective boot 7 can be disposed.

  Thereby, in the assembling work of the protective boot 7, when the annular flange portion 7C is pressed against the opening side of the boot mounting hole 8, the annular flange portion 7C enters the stepped guide portion 11 without elastic deformation. The annular flange 7C can be smoothly inserted into the stepped guide portion 11 while preventing the 7 from being distorted by a reaction force of elastic deformation or the like.

  As a result, the annular flange portion 7C can be fitted into the equal-diameter groove portion 11B of the stepped guide portion 11 with almost no gap, so that the protective boot 7 is temporarily positioned relative to the tubular portion fitting portion 9 in the radial direction. Even if they are misaligned, the stepped guide portion 11 can accurately match these axes O 1 -O 1 and O 2 -O 2, and the protective boot 7 and the cylinder fitting portion 9 can be easily aligned. Can do.

  When the protective boot 7 is pressed in this state, for example, the stepped guide portion 11 elastically deforms the annular flange portion 7 </ b> C in the reduced diameter direction and smoothly moves it toward the small-diameter tube portion fitting portion 9. It is possible to guide, and the annular flange portion 7C can be stably pushed into the tube portion fitting portion 9. Thereby, the annular collar portion 7C can be fitted into the collar portion fitting portion 10, and the protective boot 7 can be reliably assembled to the boot mounting hole 8.

  Therefore, in a brake production line or the like, it is possible to prevent improper assembly due to the displacement of the protective boot 7 or the like, and the assembly work can be performed efficiently. Further, for example, there is no need to excessively increase the alignment accuracy of the protective boot 7 by an automatic assembling machine or the like, and it is not necessary to strictly control the amount of lubricant applied around the boot mounting hole 8. Since the work process can be simplified, the productivity can be increased by a low-cost method by simply changing the shape of the boot mounting hole 8.

  Furthermore, since the position of the protective boot 7 can be prevented, for example, when setting the load, stroke, etc. of the automatic assembling machine, it is not necessary to consider the case where the position is displaced, and these settings can be easily performed. it can. Further, for example, a load judgment value for judging improper assembly of boots can be easily set, and the automatic assembly machine can be handled smoothly.

  In this case, since the stepped guide portion 11 is formed by the opening side groove portion 11A, the equal diameter groove portion 11B, and the back side groove portion 11C, the hole diameter D3 on the opening side of the stepped guide portion 11 is set to be a substantially conical opening side groove portion. 11A can be enlarged. As a result, even when the protective boot 7 is displaced, the annular flange 7C can be reliably inserted into the opening-side groove 11A, and the annular flange 7C can be inserted into the equal-diameter groove 11B by the substantially conical opening-side groove 11A. It is possible to guide smoothly toward.

  Further, since the equal diameter groove portion 11B has a constant axial dimension (full length) L, the annular flange portion 7C can be stably fitted into the equal diameter groove portion, and the protective boot 7 is aligned. Can be performed reliably. The annular flange portion 7C can be smoothly guided toward the tube portion fitting portion 9 while being uniformly reduced in diameter over the entire circumference by the substantially conical back side groove portion 11C.

  Next, FIG. 9 to FIG. 15 show a second embodiment according to the present invention, and the feature of this embodiment is that an annular collar portion is arranged at an intermediate position in the axial direction of the mounting cylinder portion of the protective boot. It is in that. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 21 denotes a protective boot provided between the arm portion 1A 'of the mounting member 1' and the sliding pin 5. The protective boot 21 is assembled to a boot mounting hole 26 described later as shown in FIGS. It is attached.

  Here, the mounting member 1 ′ has a pair of arm portions 1 A ′ and 1 A ′ (only one is shown) in substantially the same manner as in the first embodiment, and on the end surface 1 B ′ side of each arm portion 1 A ′. Are provided with a pin sliding hole 4 'and a boot mounting hole 26 around the axis O1-O1.

  The protective boot 21 is made of, for example, an elastic material such as rubber, and is integrally formed as a bellows-like cylindrical body centering on the axis O 2 -O 2. And the protective boot 21 is comprised by the below-mentioned expansion-contraction part 22, the attachment cylinder part 23, the annular collar part 24, the skirt part 25 grade | etc.,.

  Reference numeral 22 denotes a bellows-like expansion / contraction portion constituting the main body portion of the protective boot 21. The expansion / contraction portion 22 is inserted into the outer peripheral side of the sliding pin 5, and expands and contracts in the axial direction following the displacement.

  Reference numeral 23 denotes an attachment cylinder portion formed on one side in the axial direction of the telescopic portion 22, and the attachment cylinder portion 23 is formed in, for example, a cylindrical shape extending in the axial direction with a certain length M, and a boot attachment hole 26 described later. It is fitted to the tube fitting part 27. The mounting cylinder 23 has a substantially constant outer diameter a over its entire length, and this outer diameter a is set to be approximately equal to the hole diameter d1 of the cylinder fitting portion 27 as shown in the following equation (2). ing.

  For this reason, when the protective boot 21 is pressed and assembled into the boot mounting hole 26, as shown in FIG. 13 to be described later, the mounting cylinder portion 23 is almost elastically deformed in the diameter reducing direction even with a relatively small pressing force. This can be smoothly inserted into the cylinder fitting portion 27, and the axis O2-O2 of the protective boot 21 and the axis O1-O1 of the boot attachment hole 26 are aligned by the insertion operation of the attachment cylinder 23. can do.

  Further, the mounting cylinder portion 23 is formed to extend on both sides in the axial direction with the annular flange 24 interposed therebetween. And in the part which becomes the one end side of the axial direction of the attachment cylinder part 23, ie, the front end side of the insertion direction when inserting the attachment cylinder part 23 in the boot attachment hole 26, it is in the back side of the cylinder part fitting part 27. A chamfered portion 23A having a reduced diameter in a substantially conical shape (tapered) is formed. As shown in FIG. 12 described later, the chamfered portion 23 </ b> A cooperates with the conical guide portion 29 of the boot mounting hole 26 so that the mounting cylindrical portion 23 faces the center position of the cylindrical portion fitting portion 27 in the radial direction. To guide you.

  In addition, the mounting cylinder portion 23 has a front cylinder portion 23B including a chamfered portion 23A located on the front side in the insertion direction with respect to the annular flange portion 24 with respect to the insertion direction into the boot mounting hole 26. A portion located on the rear side in the insertion direction with respect to the flange portion 24 is a rear cylinder portion 23C.

  Further, the mounting cylinder portion 23 is elastically interposed between the cylinder portion fitting portion 27 and the sliding pin 5 in substantially the same manner as in the first embodiment, and thereby, in the pin sliding hole 4 '. The sliding pin 5 is prevented from rattling and the like, and the inclination of the sliding pin 5 due to an external force or the like is allowed to some extent to suppress the galling between the mounting member 1 ′ and the sliding pin 5.

  Reference numeral 24 denotes an annular flange portion formed at an intermediate position in the axial direction of the mounting cylinder portion 23. The annular flange portion 24 is formed to have a larger diameter than the front cylinder portion 23B and the rear cylinder portion 23C of the mounting cylinder portion 23, and The tube portion 23B and the rear tube portion 23C protrude radially outward from the mounting tube portion 23 and are spaced apart from the chamfered portion 23A in the axial direction. Here, the intermediate position in the axial direction where the annular flange portion 24 is formed is not limited to a dimensional intermediate position that divides the length M of the mounting cylinder portion 23 into two equal parts. Including any intermediate position away from both axial ends of the mounting cylinder 23.

  The annular flange 24 is fitted into the cylindrical portion by being pushed into the cylindrical portion fitting portion 27 of the boot mounting hole 26 in a state of being elastically deformed in the reduced diameter direction in substantially the same manner as in the first embodiment. It is fitted in the collar fitting part 28 via the part 27 in a retaining state.

  In this case, since the annular flange 24 is formed at an intermediate position in the axial direction of the mounting cylinder portion 23, in assembling the protective boot 21, first, the front cylinder portion 23 </ b> B of the mounting cylinder portion 23 is fitted to the cylinder portion. As shown in FIGS. 13 and 14 to be described later, when the annular flange portion 24 is pushed into the cylindrical portion fitting portion 27 after that, the shaft of the portion that receives the pressing force in the protective boot 21 can be inserted. The direction length can be shortened by the amount corresponding to the front tube portion 23B.

  Reference numeral 25 denotes an annular skirt formed to project radially outward on the other axial side of the mounting cylinder 23. The skirt 25 has a boot mounting hole 26 in substantially the same manner as in the first embodiment. The boot mounting hole 26 is protected from foreign matters such as dust and moisture by elastically contacting the end surface 1B ′ of the mounting member 1 ′ at the closed position.

  On the other hand, reference numeral 26 denotes a boot mounting hole provided in the arm portion 1A 'of the mounting member 1'. The boot mounting hole 26 is a pin as in the first embodiment as shown in FIGS. By expanding the diameter of the opening side of the sliding hole 4 ', it is formed as a circular stepped hole that opens in the end surface 1B' of the arm 1A '. The boot mounting hole 26 includes a cylinder fitting portion 27, a flange fitting portion 28, and a conical guide portion 29, which will be described later, which are formed coaxially with the axis O1-O1 as the center.

  Reference numeral 27 denotes a cylindrical portion fitting portion formed as a cylindrical hole having a constant hole diameter d1, for example. The cylindrical portion fitting portion 27 extends on both sides in the axial direction with the flange fitting portion 28 interposed therebetween, The hole diameter d1 is formed smaller than the outer diameter of the annular flange 24. Moreover, the opening part of the cylinder part fitting part 27 communicates with the conical guide part 29, and the back side communicates with the pin sliding hole 4 '. In addition, in the tube portion fitting portion 27, the mounting tube portion 23 of the protective boot 21 is fitted.

  Reference numeral 28 denotes a flange fitting portion formed by expanding the diameter to an intermediate position in the length direction of the tube fitting portion 27, and the flange fitting portion 28 has a diameter larger than that of the tube fitting portion 27. It is formed as an annular concave groove, and an annular flange 24 is fitted in the inside thereof in a retaining state.

  Reference numeral 29 denotes a conical guide portion as a guide portion that is formed to open on the end surface 1B ′ of the attachment member 1 ′. The conical guide portion 29 extends from the tubular portion fitting portion 27 to the end surface 1B ′ of the attachment member 1 ′. The hole diameter d2 at the open end is larger than the hole diameter d1 of the tube fitting portion 27 (d2> d1). The conical guide portion 29 guides the mounting tube portion 23 of the protective boot 21 in the radial direction toward the center position of the tube portion fitting portion 27.

  The disc brake according to the present embodiment has the above-described configuration. Next, referring to FIGS. 10 to 15, the assembling work of the protective boot 21 using an automatic assembling machine (not shown) or the like. explain.

  In this assembling operation, as shown in FIG. 10, the protective boot 21 and the boot mounting hole 26 are first set coaxially, and then a predetermined load (pressing force), stroke, etc., as in the first embodiment. To press the protective boot 21.

  In this case, for example, even when the protective boot 21 is displaced to some extent in the radial direction, the chamfered portion 23A of the protective boot 21 is first inserted into the conical guide portion 29 of the boot mounting hole 26 as shown in FIGS. These conical inclined surfaces are in contact with each other. As a result, the mounting cylinder portion 23 of the protective boot 21 is guided toward the center position of the boot mounting hole 26 by the chamfered portion 23A and the conical guide portion 29. Therefore, when the protective boot 21 is further pressed, FIG. As shown in FIG. 3, the front tube portion 23B of the mounting tube portion 23 is inserted into the tube portion fitting portion 27.

  At this time, the mounting cylinder part 23 enters the cylinder part fitting part 27 having a hole diameter d1 substantially equal to the outer diameter a with little elastic deformation even with a relatively small pressing force. As a result, the protective boot 21 is aligned with the cylindrical portion fitting portion 27 coaxially by the mounting cylindrical portion 23 while maintaining a free shape without receiving a reaction force of elastic deformation from the mounting member 1 'side. It will be in the state.

  Next, as shown in FIG. 14, by applying a relatively large pressing force to the protective boot 21, the annular flange portion 24 is elastically deformed and pushed into the cylindrical portion fitting portion 27. In this case, the protective boot 21 can stably receive the pressing force by a portion of the mounting tube portion 23 excluding the front tube portion 23B, that is, a short portion from the expansion / contraction portion 22 to the annular flange portion 24. Can be prevented from occurring.

  Therefore, by further pressing the protective boot 21, as shown in FIG. 15, the annular flange portion 24 can be smoothly fitted into the flange fitting portion 28, and the protective boot 21 is pulled out into the boot mounting hole 26. Can be assembled in the stopped state.

  Thus, according to the present embodiment, since the annular flange portion 24 of the protective boot 21 is arranged at the intermediate position in the axial direction of the mounting cylinder portion 23, the annular flange portion 24 is assembled in the assembling work of the protective boot 21. Is inserted into the cylindrical portion fitting portion 27 with a relatively small pressing force, first, before it is elastically deformed with a large pressing force and pushed into the cylindrical portion fitting portion 27. be able to.

  And when pushing in the annular collar part 24 in the cylinder part fitting part 27, shorten the axial direction length of the site | part which receives pressing force among the protective boots 21 by the part of the front cylinder part 23B inserted beforehand. Can do. As a result, the pressure-receiving portion of the protective boot 21 can be formed into a short shape that is not easily distorted with respect to the axial pressing force, and an unexpected distortion is prevented from occurring in the boot due to the pressing force of an automatic assembly machine or the like. be able to.

  In this way, at the initial stage of the assembling work, it is not necessary to apply a large pressing force to the protective boot 21 that is easily distorted, and only when the annular collar 24 of the boot is pushed into the tube fitting portion 27, the distortion is prevented. Since it is sufficient to apply a large pressing force to the protective boot 21 in a difficult state, the annular collar 24 is stably fitted to the collar fitting part 28 while preventing the boot from being distorted throughout the assembly work. be able to.

  In this case, since the chamfered portion 23A is provided on the insertion end side of the protective boot 21 and the conical guide portion 29 is provided on the opening side of the boot mounting hole 26, the protective boot 21 is provided at the initial stage of the assembly work. Even in the state where the position is displaced in the radial direction, the chamfered portion 23A and the conical guide portion 29 can smoothly guide the attachment tube portion 23 into the tube portion fitting portion 27.

  Further, since the outer diameter a of the mounting cylinder portion 23 and the hole diameter d1 of the cylinder fitting portion 27 are formed to be substantially equal, when the protective boot 21 is further pressed, a relatively small pressing force is obtained. In addition, the front tube portion 23B of the mounting tube portion 23 can be smoothly inserted into the tube portion fitting portion 27 without being elastically deformed. As a result, the axis O2-O2 of the protective boot 21 and the axis O1-O1 of the boot mounting hole 26 can be accurately aligned, and the subsequent insertion operation can be performed stably.

  Therefore, in a brake production line or the like, it is possible to prevent improper assembly from occurring due to, for example, the setting state of the load (pressing force) of the automatic assembly machine or the displacement of the protective boot 21. Work can be performed efficiently. This eliminates the need to strictly manage the alignment accuracy of the protective boot 21 and the amount of lubricant applied, as in the case of the first embodiment, and reduces the load, stroke, etc. of the automatic assembly machine. Since it can be set easily, the work process can be simplified to increase productivity.

  In each of the above embodiments, the mounting members 1 and 1 ′ are provided with the pin sliding holes 4 and 4 ′ and the boot mounting holes 8 and 26, and the caliper 2 is provided with the sliding pin 5. However, the present invention is not limited to this. For example, a slide pin may be provided on the attachment member, and a guide hole and a boot attachment hole may be provided on the caliper.

  In the embodiment, the disk brake mounted on a vehicle such as an automobile has been described as an example. However, the present invention is not limited to this, and can also be applied to a disc brake for a motorcycle.

FIG. 2 is a front view showing the disc brake according to the first embodiment of the present invention with a part broken away. It is an expanded sectional view which expands and shows the protective boot, the boot attachment hole, etc. in FIG. It is an expanded sectional view shown in the state before attaching a protection boot to a boot attachment hole. It is an expanded sectional view showing the state where the protective boot was displaced from the boot mounting hole. It is an expanded sectional view which shows the state which pressed the protective boot against the step guide part of the boot attachment hole. It is an expanded sectional view which shows the state which aligned the protective boot coaxially with the cylinder part fitting part by the stepped guide part. It is an expanded sectional view which shows the state which pushed the annular collar part of the protective boot into the cylinder part fitting part of the boot attachment hole. It is an expanded sectional view which shows the state which fitted the annular collar part of the protective boot to the collar part fitting part of a boot attachment hole. It is the expanded sectional view which looked at the disc brake by the 2nd Embodiment of this invention from the same position as FIG. It is an expanded sectional view shown in the state before attaching a protection boot to a boot attachment hole. It is an expanded sectional view showing the state where the protective boot was displaced from the boot mounting hole. It is an expanded sectional view which shows the state which guides a protective boot toward the center position of a boot attachment hole by a chamfer and a conical guide part. It is an expanded sectional view showing the state where the protection boot and the boot attachment hole were aligned coaxially by the attachment cylinder part. It is an expanded sectional view which shows the state which pushed the annular collar part of the protective boot into the cylinder part fitting part of the boot attachment hole. It is an expanded sectional view which shows the state which fitted the annular collar part of the protective boot to the collar part fitting part of a boot attachment hole.

Explanation of symbols

1, 1 'mounting member 1A, 1A' arm part 1B, 1B 'end face (surface)
2 Caliper 3 Friction pad 4, 4 'Pin sliding hole 5 Sliding pin 7, 21 Protective boot 7A, 22 Expandable part 7B, 23 Mounting cylinder part 7C, 24 Annular collar part 8, 26 Boot mounting hole 9, 27 Tube part Fitting part 10, 28 Fitting part fitting part 11 Stepped guide part 11A Opening side groove part 11B Equal-diameter groove part 11C Back side groove part 23A Chamfering part 23B Front cylinder part 23C Rear cylinder part 29 Conical guide part (guide part)
D1, D2, D3, D4, d1, d2 Hole diameter A, a Outer diameter M Length D Disc

Claims (4)

A mounting member that is mounted on a non-rotating portion of the vehicle and supports the caliper slidably via a sliding pin, and the sliding pin provided on one of the mounting member and the caliper is slidable In order to protect the sliding surface of the pin sliding hole, the boot mounting hole formed by expanding the diameter of the opening side of the pin sliding hole, and the pin sliding hole and the sliding pin In a disc brake provided with a cylindrical protective boot in which one side in the axial direction is fitted into the boot mounting hole and the other side in the axial direction is attached to the outer peripheral side of the sliding pin,
The protective boot includes an expansion / contraction portion that is inserted into the outer peripheral side of the sliding pin so as to be expandable / contractable in the axial direction, an attachment tube portion formed on one axial side of the expansion / contraction portion, and an axial direction of the attachment tube portion Consists of an annular flange formed to protrude radially outward from one side,
The boot mounting hole is formed with a diameter smaller than the annular flange portion of the protective boot, and a diameter of the tube mounting portion into which the mounting tube portion is fitted, and the diameter of the tube fitting portion is increased to the back side of the tube portion fitting portion. A flange fitting portion that is formed and fitted with the annular flange portion, and an axial intermediate portion located on the opening side of the tube portion fitting portion has a hole diameter substantially equal to the outer diameter of the annular flange portion. A disc brake comprising a stepped guide portion that is formed in a stepped shape and guides the annular flange toward the tube portion fitting portion.   The stepped guide portion of the boot mounting hole has an opening-side groove portion that opens on the surface of the one member with a diameter larger than that of the annular flange and is reduced in a conical shape toward the back side, and the opening-side groove. An equal-diameter groove portion that communicates with the back side of the portion and has a hole diameter substantially equal to the outer diameter of the annular flange portion of the protective boot and extends coaxially with the tubular portion fitting portion, and a substantially conical shape from the back side of the equal-diameter groove portion The disc brake according to claim 1, wherein the disc brake is configured by a back side groove portion that is reduced in diameter to communicate with the tube portion fitting portion. A mounting member that is mounted on a non-rotating portion of the vehicle and supports the caliper slidably via a sliding pin, and the sliding pin provided on one of the mounting member and the caliper is slidable In order to protect the sliding surface of the pin sliding hole, the boot mounting hole formed by expanding the diameter of the opening side of the pin sliding hole, and the pin sliding hole and the sliding pin In a disc brake provided with a cylindrical protective boot in which one side in the axial direction is fitted into the boot mounting hole and the other side in the axial direction is attached to the outer peripheral side of the sliding pin,
The protective boot, the expansion and contraction portion which is telescopically inserted in the axial direction on the outer peripheral side of the sliding pin, extends with a length in the axial direction is formed on one axial side of the stretchable portion Rutotomoni, the axial An attachment tube portion having a chamfered portion that is reduced in diameter toward one side in the axial direction at one end portion, and an annular flange formed to project radially outward at an intermediate position in the axial direction of the attachment tube portion And consists of
The boot mounting hole is formed to have a diameter smaller than the annular flange portion of the protective boot, and is extended to a cylindrical portion fitting portion into which the mounting cylindrical portion is fitted, and an intermediate position in the length direction of the cylindrical portion fitting portion. A flange portion that is formed with a diameter and is fitted with the annular flange portion, and a chamfered portion of the mounting tube portion that is formed on the opening side of the tube portion fitting portion is directed toward the tube portion fitting portion. A disc brake characterized by comprising a guide part for guiding the   The disc brake according to claim 3, wherein the mounting cylinder part of the protective boot is formed to have an outer diameter substantially equal to a hole diameter of the cylinder fitting part of the boot mounting hole.

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