JP4639139B2 - Boot retainer for vehicle disc brake - Google Patents

Description

  The present invention relates to the shape of a boot retainer used when mounting a piston boot of a vehicle disc brake.

Japanese Utility Model Publication No. 6-12844

  A disc-shaped piston boot made of a soft elastic material is generally installed in the opening of the cylinder located in the caliper body of a vehicle disc brake to prevent dust and water from entering the cylinder. Has been. The piston boot can be mounted on the mounted portion by directly connecting the peripheral end of the piston boot to the mounted portion, for example, by fitting it in a fitting groove formed on the mounted portion. Conventionally, there are various methods such as a method in which a piston ring formed of a metal spring member is disposed at the peripheral end portion of the piston boot, and the peripheral end portion is connected and fixed to the mounted portion by the piston ring.

  Among them, as shown in Patent Document 1, a method in which a metal boot retainer is connected to a piston boot made of soft elastic material and the piston boot is mounted on the mounted portion via this boot retainer has been generally performed. It has been broken. In this method, the boot retainer and the piston boot are integrally molded so that one end of the disc-shaped boot retainer is embedded in the peripheral end of the piston boot made of soft elastic material. And the boot retainer.

  However, in the method shown in Patent Document 1, when one end of a metal boot retainer is disposed in a piston boot made of a soft elastic material, the edge of the one end of the boot retainer contacts the piston boot. At this time, since the end edge of the boot retainer has a corner, there is a possibility that the piston boot may be damaged when the piston boot is elastically deformed.

  Accordingly, the present invention is intended to solve the above-described problems, and is integrated with a peripheral end portion which is an outer peripheral end or an inner peripheral end of a disk-like soft elastic piston boot provided for a vehicle disc brake. In the boot retainer that is fixed and placed between the piston boot and the mounted part of the caliper body, the piston boot is prevented from being damaged or damaged due to contact with the embedded edge of the boot retainer, and the durability of the piston boot It is intended to increase.

In order to solve the above-described problems, the present invention is integrally fixed to a peripheral end portion which is an outer peripheral end or an inner peripheral end of a disk-like soft elastic piston boot provided in a vehicle disc brake, In the boot retainer arranged between the mounted part of the caliper body, one end of the boot retainer body is folded back to the other end via the bent part to form a folded part, and this bent part is formed into the piston boot. with disposing buried by molding the peripheral end portion of, but which projects the edge of the folded portion to the outside of the peripheral edge or al piston boots piston boots.

  Further, one or a plurality of through holes are provided in one or both of the folded portion and the boot retainer body facing the folded portion, and the through holes are embedded in the peripheral end portion of the piston boot. It may be a thing.

  Further, the boot retainer body facing the folded portion and the folded portion is formed with a pair of through holes at one or a plurality of positions through the opposed position, and the through holes are formed in the peripheral end portion of the piston boot. It may be embedded.

Further, the boot retainer body forms a curved portion curved in an arc shape by folding the other end opposite to the piston boot connection side to the piston boot connection side, and the curved tip of the curved portion is connected to the caliper body. After being arranged facing the concave groove formed in the mounted part, the curved tip may be pressed and deformed to extend the curved tip so that it can be inserted into and engaged with the concave groove.

  In the present invention, as described above, the bent portion of the boot retainer disposed between the piston boot and the mounted portion of the caliper body is embedded in the piston boot, and the edge of the folded portion is formed outwardly from the piston boot. Because the end of the boot retainer is not embedded in the piston boot, the piston boot is prevented from being damaged or damaged due to contact with the end of the boot retainer, thereby increasing the durability of the piston boot. It becomes possible. Further, since the bent portion of the boot retainer is embedded in the peripheral end portion of the piston boot, the boot retainer and the piston boot can be reliably connected.

  A first embodiment of the present invention will be described with reference to FIGS. 1 to 5. Reference numeral 1 denotes a piston boot, which is formed in a disk shape having a circular opening at the center as shown in FIG. The piston boot (1) is made of a soft elastic rubber material and has an annular bellows portion (2) in the circumferential direction.

  Further, as shown in FIG. 1, a first boot retainer (5) and a second boot retainer (6) are connected to the inner peripheral end (3) and the outer peripheral end (4) of the piston boot (1), respectively. Yes. The first boot retainer (5) and the second boot retainer (6) are made of metal, and are formed in a disc shape with an opening hole in the center.

Then, as shown in FIG. 3, the first boot retainer is folded back to the other end (27) side through the bent portion (20) of the first boot retainer. The folded portion (8) is formed in the circumferential direction.

  Similarly to the folded portion (8) of the first boot retainer, one end portion (10) of the second boot retainer is folded through the bent portion (22) of the second boot retainer, so that the second boot retainer is folded. A folded portion (11) of the retainer is formed in the circumferential direction. Further, as shown in FIG. 3, the second boot retainer main body (15) has the other end (12) of the second boot retainer opposite to the one end (10) of the second boot retainer in the circumferential direction. It is bent into an L shape.

  Further, the folded portion (8) of the first boot retainer and the first boot retainer main body (13) are formed with a pair of through holes (18) in an annular shape at a plurality of locations. The pair of through-holes (18) is formed through the shape of the first boot retainer at a time in a state where the folded portion (8) of the first boot retainer and the first boot retainer body (13) are overlapped. The folded portion (8) and the first boot retainer main body (13) are respectively provided so as to penetrate the opposing positions.

  Further, in the first embodiment, as described above, the through-hole (18) is formed at a time through the opposing position in both the folded portion (8) of the first boot retainer and the first boot retainer main body (13). However, in another different embodiment, when the piston boot (1) is molded, if the through hole (18) can be embedded in the piston boot (1), the first boot retainer A through hole (18) can be formed at any position of the folded portion (8) and the first boot retainer body (13). However, as in the first embodiment, it is possible to save time and work efficiency by forming the through hole (18) through the folded portion (8) of the first boot retainer and the first boot retainer body (13) at a time. It will be good.

  Similarly to the first boot retainer (5), the second boot retainer (6) is overlapped with the folded portion (11) of the second boot retainer and the second boot retainer body (15) to form a pair of through holes. (18) is formed to penetrate at a time, and such a pair of through holes (18) are provided in an annular shape at a plurality of locations of the second boot retainer (6).

  Then, the first boot retainer (5) and the second boot retainer (6) formed as described above are connected to the inner peripheral end (3) and the outer peripheral end (4) of the piston boot (1), respectively. The method for connecting the first boot retainer (5) and the second boot retainer (6) to the piston boot (1) will be described in detail below. First, as shown in FIG. 3, the first boot retainer (5) will be described. The first boot retainer has a bent portion (20) and a through hole (18) embedded in an inner peripheral end (3) of the piston boot (1) and an outer peripheral edge (21) of the first boot retainer. Is molded integrally with the inner peripheral end (3) of the piston boot (1) so that the outer peripheral end protrudes outward from the inner peripheral end (3).

In the second boot retainer (6), the bent portion (22) and the through hole (18) of the second boot retainer are connected to the piston boot (1) as in the case of the first boot retainer (5). thereby embedding disposed on the outer peripheral edge (4) in the outer peripheral edge of the second boot retainer (23) projects outwardly of the outer peripheral edge (4) or al piston boot (1) of the piston boot (1) The piston boot (1) is molded integrally.

As described above, the outer peripheral edge (21) of the first boot retainer and the outer peripheral edge (23) of the second boot retainer are respectively connected to the inner peripheral end (3) and the outer peripheral end (4) of the piston boot (1). Since the piston boot (1) protrudes outward , the piston boot (1) does not contact the outer peripheral edge (21) of the first boot retainer and the outer peripheral edge (23) of the second boot retainer. It will be a thing. Therefore, the piston boot (1) is not damaged by contact with the outer peripheral edge (21) of the first boot retainer and the outer peripheral edge (23) of the second boot retainer. It is possible to prevent damage and breakage and enhance durability.

  Further, during molding, the rubber material of the piston boot (1) enters the through hole (18) formed in the first boot retainer (5) and the second boot retainer (6) to form the piston boot (1). Therefore, the first boot retainer (5) and the second boot retainer (6) are not easily detached from the piston boot (1), and the piston boot (1), the first boot retainer (5), and the second boot retainer (6 ) Can be made stronger.

  The piston boot (1) to which the first boot retainer (5) and the second boot retainer (6) are connected as described above is connected to an electric disc brake as a vehicle disc brake as shown in FIGS. Attach to the mounted part. The mounting method of the piston boot (1) to the mounted portion will be described in detail below. First, as shown in FIG. 4, a pad pressing plate (in a caliper body (35) which is a mounted portion of the electric disc brake) An annular outer circumferential step (30) is formed on the outer circumferential surface of 24), and an annular inner circumferential step (31) is formed on the inner circumferential surface of the cylinder (25) in the caliper body (35), which is also a mounted portion. ).

  Then, as shown in FIG. 5, the other end portion (27) of the first boot retainer connected to the piston boot (1) cannot be detached by being snapped onto the outer peripheral step portion (30) of the pad pressing plate (24). While being fitted and arranged, the other end (12) of the second boot retainer is engaged and arranged on the inner peripheral step (31) of the cylinder (25). At this time, the other end (12) of the second boot retainer is biased toward the inner peripheral step (31) by the bellows (2) of the piston boot (1). The portion (12) can be stably arranged from the inner peripheral step portion (31) with difficulty in disengagement. Thereby, as shown in FIG. 4, the piston boot (1) is disposed between the pad pressing plate (24) and the cylinder (25) so as to be extendable and contractable, and the cylinder (25) and the pad pressing plate (24) The opening (26) between the two is closed so that intrusion of dust, moisture, pebbles and the like into the cylinder (25) can be prevented.

  As described above, the outer peripheral edge (21) of the first boot retainer and the outer peripheral edge (23) of the second boot retainer are respectively connected to the inner peripheral end (3) and the outer peripheral end (4) of the piston boot (1). The outer peripheral edge (21) of the first boot retainer and the outer peripheral edge (23) of the second boot retainer are pistons even when the piston boot (1) expands and contracts and elastically deforms. The piston boot (1) can be prevented from being damaged or broken without touching or biting into the boot (1).

  In the first embodiment and the second embodiment described below, the first boot retainer (5) and the second boot retainer (6) are provided on both the inner peripheral end (3) and the outer peripheral end (4) of the piston boot (1). ), But in other different embodiments, it is possible to connect the boot retainer only to either the inner peripheral end (3) or the outer peripheral end (4) of the piston boot (1). It is.

  In the first embodiment, the other end portion (27) of the first boot retainer is formed in a flat plate shape. However, in the second embodiment of the present invention, as shown in FIG. The other end portion (27) is curved in an arc shape to form a curved portion (28). Further, an outer circumferential groove (36) having a U-shaped cross section is formed in the outer circumferential surface of the pad pressing plate (24) connecting the other end (27) of the first boot retainer. 36), as shown in FIG. 6, the other peripheral wall (33) facing the one peripheral wall (32) is shorter than the one peripheral wall (32).

  Then, the curved tip (34) of the curved portion (28) formed on the first boot retainer (5) is disposed so as to face the outer circumferential concave groove (36) formed as described above, and the curved portion (28) is disposed. Then, the outer peripheral groove (36) is pressed toward the one peripheral wall (32). As a result, as shown in FIG. 7, the bending portion (28) is deformed, and the bending tip (34) extends toward the outer circumferential groove (36) and is inserted into and engaged with the outer circumferential groove (36). It becomes.

  In this manner, the curved portion (28) of the first boot retainer (5) is pressed and deformed, and the curved distal end (34) is inserted and engaged in the outer circumferential groove (36), whereby the first boot retainer (5). And the outer circumferential groove (36) are more firmly connected. Therefore, since it is possible to arrange the piston boot (1) in a stable state on the mounted portion, it is possible to more reliably prevent the entry of foreign matter from the outside and improve the reliability of the product. It becomes possible.

Sectional drawing of the piston boot which connected the 1st boot retainer and the 2nd boot retainer which show Example 1 of this invention. 1 is an overall perspective view of a piston boot to which a first boot retainer and a second boot retainer are connected, showing Example 1. FIG. The AA line notch end view of FIG. In Example 1, sectional drawing of the state which mounted | wore the mounted part with the boot retainer. The elements on larger scale of FIG. In Example 2 of this invention, the partial end elevation which shows the state which has arrange | positioned the curved front-end | tip of a 1st boot retainer facing the outer periphery ditch | groove. In Example 2, the partial end surface figure which shows the state which press-deformed the curved part of the 1st boot retainer and inserted and engaged the curved front-end | tip in the outer periphery concave groove.

Explanation of symbols

1 Piston boot 3 Inner peripheral edge 4 Outer peripheral edge
5, 6 Boot retainer
7, 10 One end
8, 11 Folding part
13, 15 Boot retainer body
12, 27 Other end 18 Through hole
20, 22 Bending part 28 Bending part 34 Bending tip 35 Caliper body

Claims (4)

A disc-shaped soft elastic piston boot provided for a vehicle disc brake is integrally fixed to the outer peripheral end or the inner peripheral end of the piston boot, and is disposed between the piston boot and the mounted portion of the caliper body. In the boot retainer, one end portion of the boot retainer body is folded back to the other end side through the bent portion to form a folded portion, and the bent portion is molded and embedded in the peripheral end portion of the piston boot. together, the folded portion edge vehicular disk boot retainer of the brake, characterized in that protrudes outward if we piston boot peripheral end portion of the piston boot.   One or a plurality of through holes are provided in one or both of the folded portion and the boot retainer body facing the folded portion, and the through holes are embedded in the peripheral end portion of the piston boot. The boot retainer for a disc brake for a vehicle according to claim 1,   A pair of through-holes are formed in one or a plurality of locations through the facing position in the folded-back portion and the boot retainer body facing the folded-back portion, and the through-holes are embedded in the peripheral end portion of the piston boot. The boot retainer for a disc brake for a vehicle according to claim 1 or 2, wherein the boot retainer is disposed. The boot retainer body forms a curved portion that is curved in an arc shape by folding the other end opposite to the piston boot connection side to the piston boot connection side, and the curved distal end of the curved portion is covered with the cover of the caliper body. The first embodiment of the present invention is characterized in that, after being arranged facing the concave groove formed in the mounting portion, the curved tip is extended by pressing and deforming the curved portion so that the curved tip can be inserted and engaged with the concave groove. 3 is a vehicle disk brake boot retainer.

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