JPS6337533Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a retainer for holding a caliper on an anchor plate in a rail slide type disc brake.

A caliper in a disc brake is held on an anchor plate by two retainers, and is configured to slide on a rail portion when the brake is activated. This movement of the caliper is achieved by the hydraulic piston built into the caliper pressing the pad as a wear material against the rotor.
Due to the reaction, the piston is formed to move in the direction opposite to the direction of the force by the amount of wear on the pad, and the pressure is removed at the same time as the brake is released. The pad is pulled back by the amount of deformation of the pad to maintain a gap between the rotor and the pad.
Therefore, when the brake is released, the caliper also moves a short distance in the opposite direction from when the brake is applied, and adjustments during this time are automatically made. Further, this caliper is formed so that a retainer spring of a retainer fixed to an anchor plate directly contacts the outer surface of the caliper, and the caliper is held with an appropriate pressing force by the spring action of the retainer spring. Therefore, if rust forms on the contact area between the retainer spring and the caliper, or rust forms on the rail, the sliding resistance will increase rapidly, and the caliper will not return sufficiently when the brake is released, resulting in a semi-braked state. There are inherent problems. The object of this invention is to provide a retainer for a rail slide type disc brake that solves these problems and has a slide rail at the contact portion with the retainer spring caliper.

This invention will be explained in detail based on illustrated embodiments.

FIG. 1 is a perspective view of the disc brake, FIG. 2 is a sectional view of the caliper, and FIG. 3 is an enlarged view of the caliper holding portion. 1 in the figure is the rotor,
2 is the caliper, 3 is the piston, 4 is the pad, 5
is a seal, 6 is a boot, 7 is a retainer, 8 is a retainer spring, and 9 is an anchor plate. As shown in FIG. 3, the caliper 2 has slide arms 11 formed at both ends of the caliper 2 placed on a slide base 10 provided in a shelf-like manner protruding from the anchor plate 9. The outer surface of the slide arm 11 of the caliper 2 is pressed and held by the retainer spring 8 of the retainer 7 screwed and fixed to the anchor plate 9, and when the disc brake is operated, the slide base 10 and the slide arm 11 are held together. The outer surface of the slide arm 11 that comes into contact with the retainer spring 8 is also formed as a sliding surface. In addition, the movement of the caliper 2 is such that the piston 3 moves while pressing the pad 4 while elastically deforming the seal 5. As the piston moves in the opposite direction, and as the amount of wear on the pad 4 increases, the amount of deformation of the seal 5 increases. The piston 3 moves by the amount exceeding , and the amount of movement of the caliper increases accordingly. Further, when the brake is released, the piston 3 is pulled back by the amount of deformation of the seal 5, and the caliper 2 is also formed to return by that amount. Therefore, in this invention, as shown in FIG. 4, a slide rail 12 is provided on the retainer spring 8 of the retainer 7 that holds the caliper 2.
The contact surface between the slide rail 12 and the slide arm 11 is formed as a sliding surface. Furthermore, as shown in FIGS. 6 and 7, the slide rail 12 includes a rail main body 1 formed in a channel shape having a groove width that loosely fits a retainer spring 8 formed from a round steel bar into a B-shape.
The locking pieces 14 and 15 are formed by cutting the corners of both end edges of 3 and curving one of the standing walls in an arc shape in the same direction.
It is formed by providing. The radius of curvature of the curved portions of the locking pieces 14 and 15 is formed to be slightly larger than the radius of curvature of the curved portion of the retainer spring 8, and the retainer spring 8 is loosely fitted into the channel-shaped rail main body 13. The locking pieces 14 and 15 are formed to have a spring function when the tips of the locking pieces 14 and 15 are brought into contact with the retainer spring 8. Furthermore, the entire length of the slide rail 12 is formed to be approximately the same length as the contact length of the retainer spring 8 with the caliper 2. The vertical wall portions facing the locking pieces 14 and 15 are formed by cutting out the vertical wall portions, and the hook portions 1 are formed so as to be easily slidable.
6 and 17 are provided so as to be engaged with the retainer spring 8. In addition, the slide rail 12
As shown in FIGS. 5 and 6, when the retainer spring 8 is inserted and locked, the outside length of the locking pieces 14 and 15 of the slide rail 12 is made shorter than the inside length of the retainer spring 8. Thus formed, the outer sides of the locking pieces 14 and 15 are formed so that they fit loosely with an allowance. This slide rail 1
2 is made of rust-resistant steel such as chrome stainless steel or non-rust steel such as chrome nickel stainless steel. Therefore, the retainer 7 in which the slide rail 12 is provided on the retainer spring 8,
The channel-shaped rail main body 13 of the slide rail 12 is set on the anchor plate 9 so that the outer surface of the bottom wall is in contact with the outer surface of the slide arm 11 of the caliper 2. When the caliper 2 moves in this state when the brake is applied, the outer surface of the slide arm 11 of the caliper 2 slides on the outer surface of the bottom wall of the slide rail 12 and tries to drag the slide rail 12 together. Due to this dragging force, the slide rail 12 is dragged using the contact surface with the retainer spring 8 as a sliding surface, and the curved tip of the locking piece 14 in the moving direction comes into contact with the retainer spring 8 . Thereafter, the spring force of the locking piece 14 is overcome and the movement progresses, and the curved portion of the locking piece 14 comes into contact with the retainer spring 8 and the entire curved portion. As the caliper 2 moves further, only the caliper 2 moves while sliding on the outer surface of the bottom wall of the slide rail 12. When the brake operation is released and the piston 3 is depressurized, the spring action of the locking piece 14 of the slide rail 12 attempts to return the caliper 2. This returning force helps the caliper 2 return so that an appropriate gap is always maintained between the rotor 1 and pad 4. Further, the other locking piece 15 adjusts the return amount of the caliper 2. In other words, it works to prevent the caliper from returning unnecessarily. That is, the play in the sliding direction between the locking pieces 14, 15 and the retainer spring 8 is appropriately set depending on the amount of movement and return amount of the caliper 2.

Since this invention is constructed as claimed in the utility model registration based on the above-mentioned embodiment, it is difficult for rust to form on the contact surface between the retainer spring and the caliper, and there is less risk of increased sliding resistance due to rust. Become. Further, since the slide rail is provided with a locking piece, the caliper can be easily returned and the brake is not left in a half-braked state. Further, since the outer surface of the bottom wall of the slide rail is in contact with the caliper over the entire area, the caliper can easily slide without causing local catch. Further, in the case where the locking pieces are provided at both ends, the amount of return of the caliper can be checked, so that unnecessary movement of the caliper can be stopped. In addition, the manufacturing cost of a slide rail formed in a channel shape is low, and it is possible to provide a practical slide rail that does not directly lead to a product price.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the disc brake, Fig. 2 is a cross-sectional explanatory view of the caliper, Fig. 3 is an enlarged explanatory view of the caliper holding part, Fig. 4 is an enlarged explanatory view of the caliper holding part according to this invention, and Fig. 5 The figure is a plan view of the retainer according to this invention, FIG. 6 is a plan explanatory view of the slide rail, and FIG. 7 is a side view thereof. Explanation of symbols, 1... Rotor, 2... Caliper, 3... Piston, 4... Pad, 5... Seal, 6... Boot, 7... Retainer, 8... Retainer spring, 9... Anchor plate ,
DESCRIPTION OF SYMBOLS 10... Slide base, 11... Slide arm, 12... Slide rail, 13... Rail body, 14, 15... Locking piece part, 16, 17... Hook part.

Claims (1)

[Claims for Utility Model Registration] (1) In a retainer for a slide rail type disc brake, a retainer spring 8 of a retainer 7 that presses and holds the caliper 2 by contacting the outer surface of the slide arm 11 of the caliper 2 is attached to the retainer. A rail main body 13 formed in a channel shape with a groove width that loosely fits into the spring 8 and made of a rust-resistant material;
A slide rail 12 is provided on the end edge of the slide rail 12 in which one vertical wall is curved in an arc shape to form a locking piece with a spring action that helps the caliper 2 return. A retainer for a rail slide type disc brake, characterized in that the outer surface of the rail body 13 is in contact with the retainer spring 8, and the bottom inner surface of the rail body 13 is in contact with the retainer spring 8. (2) A retainer for a rail slide type disc brake according to claim 1, which is provided with a slide rail 12 with locking pieces formed on both end edges of the rail body 13.