JPH01250628A - Pin slide caliper floating type disk brake - Google Patents

Abstract

PURPOSE:To make slide motion in a caliper so nimble by setting up a fitting part, being installed in the caliper or a support member and slidable with a pair of slide pins, in a position passing through the center of gravity of the caliper, looking from the rectangular direction, on a flat surface where a straight line connecting the center of gravity of a fitting surface between this fitting part and the slide pin comprises each axis of the slide pins. CONSTITUTION:A fitting center between a slide pin 34 and an arm part 54 or the fitting part is a point A or the center of gravity of the inner circumferential surface of a fitting hole 56. Likewise a fitting center of another slide pin 36 is a point B or the center of gravity of the inner circumferential surface of a part, where the slide pin 36 is actually fitted, in fitting holes 80 of a connecting part 78. Dimensions of each part of a disk brake are determined so as to pass through the center of gravity G of a caliper 16 as a straight line connecting these points A and B, namely, a support center line of the caliper 16 by a mounting bracket 38 is shown by a dashed line. Thus, turning moment based on dead load of the caliper 16 is reduced, so that slide motion of the caliper is made so nimble, and any draw is thus preventable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pin slide type caliper floating type disc brake.

Conventional pin slide caliper floating type disc brakes are arranged so that they straddle a disc rotor and a pair of friction pads arranged on both sides of the disc rotor, and the caliper that presses the friction pads against the disc rotor It is supported movably in a direction parallel to the axis of the disc rotor by a support member via a pin.

There are two types of this type of disc brake. One type is the disc brake described in, for example, Japanese Utility Model Publication No. 61-24736, in which a pair of slide pins are
The mounting bracket, which is a supporting member, is erected in parallel with the axis of the disc rotor and oriented away from the disc rotor, and slidably supports the caliper by fitting into a fitting part formed on the caliper. ing.

Another type is a disc brake described, for example, in Japanese Utility Model Publication No. 59-21293, in which a pair of slide bins are mounted on the arms of a caliper in parallel with the axis of the disc rotor and in a direction approaching the disc rotor. The caliper is erected and is fitted into the fitting portion of the mounting bracket to slidably support the caliper.

In these conventional disc brakes, the fitting center between the pair of slide bins and the fitting part (the center of gravity of the fitting surface that actually fits the slide bin among the inner peripheral surfaces of the fitting hole of the fitting part)
When viewed from a direction perpendicular to the plane containing the axis of the slide bin, the straight line connecting them passes through a position away from the center of gravity of the caliper. If you look at a type of disc brake in which the slide bin is fitted to the caliper's fitting part from the above direction, the straight line connecting the fitting centers of the pair of fitting parts will be on the inner side (of the vehicle body) from the caliper's center of gravity. , that is, it passes through the hydraulic cylinder side of the caliper, and when the slide bin is fitted into the fitting part of the mounting bracket, the straight line connecting the fitting centers of the fitting part is lower than the center of gravity of the caliper. It passes through the outer side.

Note that the straight line connecting the fitting centers of the two fitting parts is the line that forms the center of support of the caliper by the support member, and therefore will be abbreviated as a support center line hereinafter as necessary.

Problems to be Solved by the Invention Therefore, in conventional disc brakes, there was a problem in that a rotational moment about the support center line was generated based on the gravity of the caliper or the inertial force accompanying the vibration of the caliper.

The caliper assembly, which consists of friction pads, calipers, and their supporting members, is usually located at a position within about half a circumference of the disc rotor, from the front end to the top end to the rear end. be. Now, if we consider the case where the caliper assembly is installed so as to straddle the top of the disc rotor, the center of gravity of the caliper will be away from the support center line when viewed from a direction perpendicular to the plane containing the axes of the pair of slide bins. If it is out of place, a rotational moment based on gravity will be generated in the caliper. Therefore, a prying force is generated between the slide bin and the fitting portion, which prevents the caliper from smoothly sliding and causes the brake to drag or squeal. In addition, rubber ring members are provided at both ends of the fitting part to always hold the slide bin at the center of the fitting part and prevent direct contact between the inner peripheral surface of the fitting part and the slide bin. This is widely practiced, but in this case, the ring member counteracts the rotational moment of the caliper,
Localized areas with high surface pressure occur. If the slide bin slides in this state, uneven wear will occur between the ring member and the slide bin.

Furthermore, while the vehicle is running, the wheels are caused to vibrate significantly in the vertical direction due to the unevenness of the road surface, and at this time, a rotational moment is generated in the caliper due to inertia. The direction and magnitude of this rotational moment change drastically as the wheel vibrates, so if a rubber ring member is provided at the fitting part, this ring member will be repeatedly subjected to compressive force. Furthermore, there is a risk that the slide bin may undergo fatigue failure due to repeated bending moments acting on the slide bin. And if you make the slide bin thicker to avoid these,
A problem arises in that the brake becomes larger and heavier.

Furthermore, as the caliper rotates around its support centerline, vibrations occur, which causes part of the friction pad to periodically come into contact with the disc rotor, increasing drag resistance and resulting in poor fuel efficiency. arise.

These problems due to deviation of the caliper's center of gravity from the support center line when viewed from a direction perpendicular to the plane containing the axis of the slide bin can occur when the caliper assembly is installed in a position that straddles the top of the disc rotor. It is the largest and decreases as the caliper placement position is changed from the top toward the front or rear end. and,
If the caliper assembly is installed so as to straddle the front or rear end of the disc rotor, the rotational moment due to gravity of the caliper and the rotational moment due to the inertia of the caliper due to the vertical vibration of the wheel will be generated. It disappears. However, since the wheel also vibrates in the longitudinal direction, a rotational moment based on the inertia of the caliper caused by this longitudinal vibration still occurs, causing problems such as deterioration of the ring member and fatigue failure of the slide pin. .

Above, we have explained the case where the center of gravity of the caliper is off the support center line when viewed from the direction perpendicular to the plane containing the axes of the pair of slide pins, but in the direction parallel to the plane containing the axes of the pair of slide pins. A similar problem occurs even if the center of gravity of the caliper is off the support center line when viewed from above. This is particularly important when the caliper assembly is installed straddling the front or rear end of the disc rotor, and decreases as the caliper assembly position moves toward the top of the disc rotor. do.

In other words, an undesirable rotational moment will occur if the center of gravity of the caliper deviates from the support center line in any direction, but in conventional disc brakes, the center of gravity of the caliper deviates from the support center line in any direction. Since the amount of deviation when viewed was particularly large, the problem caused by this deviation was particularly noticeable.

The present invention has been made with the object of solving the above problems.

Means for Solving the Problems To solve the problem, the gist of the present invention is to provide a caliper that is disposed astride a disc rotor and a pair of friction pads disposed on both sides of the disc rotor, and that presses the friction pads against the disc rotor. In a floating type disc brake with a bin slide caliper that is movably supported in a direction parallel to the axis of the disc rotor by a support member via slide pins, each of the pair of slide pins is provided on the caliper or the support member. When the fitting part that is slidably fitted with the slide pin is viewed from a direction in which the straight line connecting the center of gravity of the fitting surface of the fitting part and the slide pin is perpendicular to the plane containing the axes of the pair of slide pins, The reason is that the caliper is placed at a position passing through the center of gravity of the caliper.

Functions and Effects In a pin sliding caliper floating type disc brake, if the fitting part is arranged as described above, the rotational moment based on the caliper's own weight will be reduced, and the strain between the slide pin and the fitting part will be reduced, and the caliper will The sliding movement becomes easier, and the effect of reducing dragging and squealing can be obtained. In addition, uneven wear of the slide pin and fitting portion is also reduced.

Furthermore, the rotational moment due to the inertial force of the caliper caused by the vertical vibration of the wheel is reduced, reducing the fatigue of the slide pin, and a rubber ring member is disposed between the slide pin and the fitting part. In some cases, deterioration of the ring member is also reduced.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, 10 is a disc rotor that rotates together with the wheels. A pair of friction pads, an inner pad 12 and an outer pad 1, are provided on both sides of the disc rotor 10.
A caliper 16 is provided across both pads 12, 14 and the disc rotor 10. The caliper 16 consists of a main body 18 and a piston 20. The caliper main body 18 includes a cylinder part 22 into which the piston 20 is fitted, a reaction part 24 formed opposite to this, and a combination of the cylinder part 22 and the reaction part 2.
4 and a connecting portion 26 that connects the two. When hydraulic pressure is applied to the cylinder section 22, the piston 20 presses the inner pad 12 against one surface of the disc rotor 10, and the reaction section 24 presses the outer pad 14 against the other surface of the disc rotor 10 due to the reaction force. It is. 28 is a reaction spring, each end of each spring 28 is inserted into an insertion hole formed in the back plate 30.32 of both pads 12.14, and both pads 12.
14 from the disc rotor 10.

The caliper 16 has a slide pin 34 and a slide pin 3.
6, the mounting bracket 3 serving as a supporting member
8, it is supported movably in a direction parallel to the axis of the disc rotor 10. The slide pin 34 is a bolt 40
Spring washer 42. The flat washer 44 and the sleeve 46 are fitted in order, and the male threaded portion 48 at the tip is screwed into the female threaded hole 52 formed in the connecting portion 50 of the mounting bracket 38, so that the flat washer 44 and the sleeve 46 are fitted in parallel with the axis of the disc rotor 10 It is erected in the direction away from the disc rotor 1o. An arm portion 54, which is a fitting portion protruding from the cylinder portion 22 of the caliper 16, is fitted into the sleeve 46 with a slight clearance in the fitting hole 56, and the portion of the sleeve 46 exposed from the arm portion 54 is protected from dust. Covered with boots 58.60. One end of these dust boots 58, 60 is engaged with an engagement groove formed in the sleeve 46, while the other end is provided with thick ring portions 62, 63, respectively. Sleeve 64 hot-glued to the outside of 62.63
．． 65 are press-fitted into openings at both ends of the fitting hole 56. These ring portions 62 and 63 are connected to the sleeve 46 on the inner peripheral surface.
The sleeve 46 is normally held at approximately the center of the fitting hole 56, and when a large force is applied to the caliper 16, it is elastically deformed so that the inner circumferential surface of the fitting hole 56 aligns with the outer circumferential surface of the sleeve 46. serves as a ring member that allows contact with the

On the other hand, the slide pin 36 is connected to the cylinder portion 2 of the caliper 16.
The arm part 66 is erected in parallel with the slide pin 34 and in a direction approaching the disc rotor 10 on an arm part 66 that protrudes from the opposite side of the second arm part 54 . The slide pin 36 is connected to the bolt 68. It is fixed to the arm portion 66 by a spring washer 70 and a flat washer 72. The slide pin 36 is attached to the mounting bracket 3
The slide pin 34 of No. 8 is fitted with a slight clearance into a fitting hole 80 which is a fitting part formed by the other connecting part 78 spaced apart in the circumferential direction of the disk rotor from the connecting part 50 where the slide pin 34 is erected. The portion of the pin 36 exposed from the fitting hole 80 is covered with a dust boot 82. One end of the dust boot 82 is engaged with an engagement groove formed on the circumferential surface of the slide pin 36, and the other end is engaged with an engagement groove formed on a cylindrical projection surrounding the opening of the fitting hole 80. being engaged.

In the disc brake of this embodiment, the center of the fit between the slide pin 34 and the arm portion 54, which is the fitting portion thereof, is the point A, which is the center of gravity of the inner circumferential surface of the fit hole 56, and The center of alignment is point B, which is the center of gravity of the inner peripheral surface of the fitting hole 80 of the connecting portion 78, where the slide pin 36 is actually fitted, and the straight line connecting these points A and B. That is, the dimensions of each part of the disc brake are determined so that the center line of support of the caliper 16 by the mounting bracket 3 passes through the center of gravity G of the caliper 16, as shown by the dashed line in FIG. In this embodiment, the center of gravity G of the caliper 16 is approximately at the back plate 3 of the inner pad 12.
0 position, and as is clear from FIGS. 1 and 2, the support center line passes through the center of gravity G when viewed from all three-dimensional directions. In other words, caliper 1
6's center of gravity G is actually on the support center line.

Note that the position of point B changes somewhat as the depth of fitting of the slide pin 36 into the fitting hole 80 changes as the outer pad 14 wears, but the new outer pad 14 wears to the wear limit. If the support center line passes through the center of gravity G of the caliper 16 at some point in time, the requirements of the present invention are satisfied.

Next, another embodiment of the present invention will be described based on FIG. Note that the same members as those in the above embodiment are given the same reference numerals, and detailed explanations will be omitted.

The caliper 90 of this embodiment includes a pair of slide pins 82,
It is supported by a mounting bracket 86 via a mounting bracket 84 so as to be movable in a direction parallel to the axis of the disc rotor 10 . The slide pins 82, 84 have almost the same structure as the slide pin 36 of the previous embodiment, but the fitting holes 88 into which the slide pins 82, 84 fit are different from the fitting hole 80 of the previous embodiment. It is formed at a position a certain distance closer to the cylinder portion 22 side of the caliper 90.

In addition, the fitting hole (not shown) formed in the lower connecting part 78 in the figure is the fitting hole 8 formed in the upper connecting part 78.
8, and the fitting clearance with the slide pin 84 is increased. That is, the slide pin 82 functions as a main pin, and the slide pin 84 functions as a sub pin.

Further, a pair of arm portions 92 to which the slide pins 82 and 84 are fixed protrude from near the end of the cylinder portion 22 of the caliper 90.
6, it is provided at a position farther from the disc rotor 10.

Therefore, the fitting center of each slide pin 82, 84 is
The slide pin 82 is actually inserted into the fitting hole 88 of the connecting portion 78.
, 84 is the center of gravity of the inner circumferential surface of the fitted part
, D, and the straight line connecting these two points C1D, that is, the center line of support of the caliper 90 by the mounting bracket 86, passes through the center of gravity G of the caliper 90, as shown by the dashed line in FIG. 82,
This is a straight line perpendicular to 84.

When the disc brake is installed across the front or rear end of the disc rotor and the slide pin is composed of a main pin and a sub-pin, only the main pin will fit due to the difference in clearance between the mating parts. It comes into contact with the inner wall of the matching hole and supports the caliper. Furthermore, even when both slide pins function as main pins, there is a high possibility that one of the slide pins will come into contact with the inner wall of the fitting hole first to support the caliper. In this state, if the support center line of the caliper is not perpendicular to the main pin, that is, if the center of gravity of the caliper is not directly above or directly below the center of engagement between the main pin and the fitting hole, the force of gravity or inertia during vibration will Due to the rotational moment generated in the caliper, the contact pressure between the main pin and the fitting hole becomes uneven in the axial direction of the main pin. On the other hand, when the support center line is perpendicular to the slide pin 82, which is the main pin, as in this embodiment, such non-uniform surface pressure can be avoided.

Therefore, even if the caliper assembly of this embodiment is disposed to straddle any part of the disc rotor lO, no rotational moment is generated due to the gravity of the caliper 90 and the inertial force during vibration, and the caliper 90 can easily slide. This ensures that the occurrence of dragging and squealing is suppressed, and problems such as fatigue and uneven wear of the slide pins 82 and 84, deterioration and uneven wear of the ring portion of the dust boot, and brake dragging due to vibration of the caliper 90 are avoided. Reduced.

Note that the positions of the fitting centers C and D also change somewhat as the outer pad 14 wears and the depth of fitting of the slide pins 82 and 84 into the fitting holes 88 changes, but when the outer pad 14 is new, The requirements of the present invention are satisfied if the support center line passes through the center of gravity G of the caliper 90 at some point during which the caliper is worn down to the wear limit.

The disc brake described in detail above is literally an example, and the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art, such as changing the structure of each slide pin and their fitting parts. can do.

[Brief explanation of the drawing]

FIG. 1 is a plan view (partial view) showing a pin slide type caliper floating type disc brake, which is an embodiment of the present invention.
FIG. 2 is a schematic front view of the disc brake. FIG. 3 is a plan sectional view (partially shown) showing a disc brake according to another embodiment of the present invention. 10: Disc rotor 16: Caliper 34.36:
Slide pin 38: Mounting bracket 50: Connecting part 54: Arm part 56: Fitting hole 78: Connecting part 80: Fitting hole 82.84 Slide pin 86: Mounting bracket 88: Fitting hole 90: Caliper 92: Arm part Figure 3

Claims (1)

[Scope of Claims] A caliper is disposed astride a disc rotor and a pair of friction pads disposed on both sides of the disc rotor, and presses the friction pads against the disc rotor. In a pin-sliding caliper floating type disc brake that is movably supported in a direction parallel to the axis of the rotor, the disc brake is provided on the caliper or the support member and slidably engages with each of the pair of slide pins. The fitting portion is located at a position where a straight line connecting the center of gravity of the fitting surface of the fitting portion and the slide pin passes through the center of gravity of the caliper when viewed from a direction perpendicular to a plane including the axes of the pair of slide pins. A disc brake characterized by its placement.