JPS6049778B2 - Sliding caliper type disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to disc brakes, and more particularly to a sliding caliper type disc brake.

A sliding caliper disc brake consists of a fixed torque member, a directly actuated brake pad assembly, an indirectly actuated brake pad assembly, an actuator, and a caliper.
The caliper straddles a rotatable disk and is slidably mounted relative to a fixed torque member, and a direct actuation pad assembly is pressed against one side of the disk by an actuator that is a piston and cylinder device. ,
The reaction force causes the caliper to displace and force the indirect actuating pad assembly against the opposite surface of the disk.

The sliding connection between the caliper and the torque member of such a brake is achieved by a guide means that restrains the caliper so that it cannot move in any direction other than the axial direction, and the guide means includes two or more sets of pins and holes. A combination is fine. Preferably, the torque member carries the pin and the pin slides through a bore in the caliper.
In such conventional constructions, the pin is typically of circular cross section and is adapted to transmit a portion of the drag forces experienced by the indirectly actuating pad from the caliper to the stationary torque member. In other designs, only one pin supports the drag force, and the remaining pins are used to prevent rotation of the caliper around the pin that supports this drag force (and in some cases , to assist in positioning the pad assembly). In yet another structure,
The pin is provided solely to guide the caliper, and the drag force on the friction pad is such that it is supported by means other than the pin, such as a torque plate. A problem with these conventional constructions arises from the fact that the spacing of the holes (or pins) in the caliper must precisely match the spacing of the pins (or holes) in the torque member.

That is, if this requirement is not met, binding will occur when the caliper slides relative to the torque member.
The tension between the pin and the hole in which the pin should slide depends on the load conditions because the pin and the hole are provided in different members, and each member is subject to different degrees of strain when the brake is applied. This also occurs because the distance between the pin and the hole changes relative to each other.

This is a particularly important problem for structures having two sets of pin and hole combinations. One way to solve the problem of pin-to-hole position errors has been to make the hole larger than the pin and bias the pin into position within the hole with a spring.

The problem with this construction is that if the spring were to be damaged or not assembled correctly, the guide surface would be subject to an extremely large impact force due to the large gap between the pin and the hole. Also, since the spring needs to be strong enough to withstand vibrational forces, friction at the point receiving the spring force prevents the pin from freely sliding through the hole. UK patent application 53
No. 793/76 (Japanese Patent Application No. 52-155468 [Japanese Unexamined Patent Publication No. 54-87357, or Japanese Patent Publication No. 58-5321
In the structure described in Publication No. 4]), the pulling force is transmitted to the torque plate by a single pin of the same cross-section that is fitted into a hole of non-circular cross-section formed in the torque plate.

The present invention comprises a pair of friction pad assemblies, a fixed torque member, and a caliper member axially slidably mounted on the torque member, the caliper member having a hydraulic actuator therein, and the actuator being a caliper member. The member is slid axially relative to the torque member, causing one of the friction pad assemblies to act directly on one side of the disc, and the sliding of the caliper member causes the other friction pad assembly to act directly on one side of the disc. In a disc brake designed to act on a surface, the relative sliding between the caliper member and the torque member is performed by a piston with a non-circular cross section, and one end of the piston is defined in one rim of the caliper. The piston is slidably fitted into the piston chamber of the cross section, and the piston or a member non-rotatably connected to the piston is in non-rotatable sliding engagement with the torque member or a member non-rotatably connected to the torque member. It offers disc brakes.

Thus, in the present invention, the piston acts as an intermediate member non-rotatably connected to both the caliper member and the torque member, and the non-rotatable connection between the caliper member and the torque member is effectively achieved.

The engagement between the piston and the torque member may be direct or indirect; for example, the piston may be attached to one pad that is non-rotatably attached to the torque member. Alternatively, the torque member or a member non-rotatably connected to the torque member may have a hole with a non-circular cross section, and the piston or a member non-rotatably attached to the piston may be fitted into the hole. Preferably, the piston with a non-circular cross section and the piston chamber with the same shape constitute the actuator of the caliper member. The invention can be applied to two different brake designs.

That is, one in which the torque member itself straddles the disk and directly receives the drag force of the indirectly acting friction pad assembly, and the other in which the torque member is located on one side of the disk and the dragging force of the indirectly actuated friction pad is transmitted to the caliper member and thus It can be applied to anything that is transmitted to a piston with a non-circular cross section.
Embodiments of the present invention will be described in detail below with reference to the drawings. The embodiment shown in FIG. 1 is a brake disc 12 (dashed line).
A generally U-shaped caliper member 10 straddling the disc 12 includes a bridge portion 14 disposed radially outwardly of the disc 12 and a pair of radially inwardly extending bridge portions 14 disposed on opposite sides of the disc. Includes rims 16 and 18.

The caliper member 10 is slidably mounted on a torque plate 40, which is rigidly attached to the vehicle body by bolts passing through holes 34 (FIGS. 2-4). A piston 24 of the same shape is slidably fitted into a piston chamber 22 with a non-circular cross section defined in one rim 18 of the caliper 10, and the piston chamber 22
A hydraulic boat 125 (FIG. 3) is mounted on the end wall of the piston for connecting the piston chamber to a source of hydraulic fluid.

The inlet end of the piston chamber 22 has a scraper ring 25 which is pressed against the piston 24 to prevent dust from entering. The piston 24 is non-rotatably connected to a back plate 28 of the direct-acting friction pad assembly, to which a pad 26 is attached, for example by molding, and to the back plate 28.
The pad 26 also has a non-circular cross-section and slidably passes through a hole 29 of the same non-circular cross-section in one rim 41 of the torque plate 40. As shown in Figure 4, the back plate 2
The non-circular cross-sections of the gates 6 and 28 are similar to the non-circular cross-sections of the piston 24 and the cylinder hole (piston chamber) 22;
As can be seen from Figure 1, the former is larger in size. Attach the abutting plate 3' and the knob plate 3' to the other rim 16 of the caliper.
and are tightened with bolt 31.

The abutting plate 3' acts by abutting against the back surface of the back plate 30 of the indirectly actuated friction pad assembly. The back plate 30 carries a friction pad 27 which is also of non-circular cross section. The back plate 30 and the pad 27 slidably pass through a hole 21 of the same non-circular cross section in the other rim 42 of the torque plate 40. Pressurizing the hydraulic fluid in the piston chamber 22 causes the piston 24 to advance toward the disc 12, forcing the friction pad 26 against the disc, creating a reaction force that displaces the caliper 10 in the opposite direction;
Press the friction pad 27 against the brake disc 12.

The drag force exerted by the disk 12 on the friction pads 26, 27 is opposed by the torque plate 40, and since the friction pads 26, 27 and the holes 21, 29 in the torque plate are non-circular, the friction pads are rotated by the disk 12. is completely prevented. Similarly, the cooperation of the non-circular members prevents rotation of the caliper as a whole about the piston and cylinder axes relative to the torque plate. FIG. 5 shows a second embodiment, which includes:
The back plate 28 of the direct actuation friction pad assembly is secured to the piston 24 by bolts 32. The back plate of the indirectly actuated friction pad assembly is secured to the caliper rim by bolts 31. The embodiment of FIGS. 6-9 differs from the embodiment described above in two ways.

First, in FIGS. 1 and 5, the piston 24 is slidably fitted only into the piston chamber 22, but in FIG. It is also embedded in the same way.

A back plate 28 and a friction pad 26 of a direct-acting friction pad assembly are non-rotatably mounted on the front end surface of the piston 24, with the back plate and the friction pad both having circular cross-sections and corresponding circular holes 29'' in the torque plate 40. Second,
In the embodiment shown in FIGS. 6 to 9, the torque plate 40 does not straddle the brake disc 12, but is entirely located on the piston side of the brake disc 12. Therefore, the drag force experienced by the indirectly actuated friction pad assembly is caused by the caliper member 10 and the . and 24 to the torque plate 40.
7 to 9, the piston is connected to the torque plate 1.
2, the back plate 2 of the direct actuation friction pad assembly
position 8, and pad 2 of the indirect actuation friction pad assembly.
7 shows a cross section of the disc brake at position 7. 10-12 illustrate yet another embodiment of the invention, in which the torque plate does not have a portion into which an indirectly actuated friction pad assembly is received.

However, the back plate 43 of the direct actuation friction pad assembly is slidably fitted into the non-circular hole 29 in the torque plate 40.

As the pads 26 of the direct-acting friction pad assembly gradually wear, the metal piston 24 gradually protrudes from the piston chamber 22. As in the embodiment of FIG. 6, the surface of the piston 24 gradually moves into the bore 29 of the torque member 40. In the embodiment shown in FIG. 6, a flexible seal boot 45 is fitted between the torque plate 40 and the caliper member to prevent abrasion debris and dust from entering between the piston and the hole 29. The seal boot is adapted to expand in accordance with. In the embodiment of FIG. 10, the back plate 43 of the direct actuation pad assembly, made of plastic material, is larger in cross-section than the piston chamber 22 and is slidably fitted into the torque plate 40.

The use of plastic material for the back plate reduces the possibility of dust entering between the back plate and its sliding surface and causing unsmooth operation, and there is no need for a seal boot like the seal boot 45. effective.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the disc brake assembly of the present invention. FIG. 2 is a view of the torque plate shown in FIG. 1 viewed from the left side of FIG.
FIG. 3 is a view of the brake assembly shown in FIG. 1 seen from the right side of FIG. FIG. 4 is a sectional view taken along the line ■-■ in FIG. Fifth
The figure is a longitudinal sectional view of another embodiment of the disc brake of the present invention. FIG. 6 is a longitudinal sectional view of yet another embodiment of the disc brake of the present invention. FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6. FIG. 8 is a sectional view taken along the line ■-■ in FIG. 6. FIG. 9 is a sectional view taken along the line ■-■ in FIG. 6. FIG. 10 is a longitudinal sectional view of a disc brake assembly according to yet another embodiment of the present invention. Figure 11 is M- in Figure 10.
M-view sectional view. FIG. 12 is a sectional view taken along the line ■-■ in FIG. 10 (however, the outer friction pad assembly is omitted). 10...
・Caliper, 12... Disk, 16, 18...
...Rim, 22...Piston chamber, 24...
... Piston, 29 ... Hole, 26, 28.
...Direct actuation pad assembly, 27,30...
・Indirectly operated friction pad assembly, 40...Torque member.

Claims (1)

[Scope of Claims] 1. A friction pad assembly comprising a pair of friction pad assemblies, a fixed torque member, and a caliper member slidably attached to the torque member in the axial direction, and an actuator built in the caliper member is a friction pad assembly. one side of the assembly was pressed directly against one side of the disk and the caliper member was slid axially against the torque member so that the caliper member pressed the other friction pad assembly against the opposite side of the disk. In a sliding caliper disc brake, relative sliding between the caliper member 10 and the torque member 40 is provided by a piston 24 of non-circular cross section, one end of which is defined by one rim 18 of the caliper member. The piston or the members 26, 28 that are slidably fitted into the same-shaped piston chamber and that are non-rotatably connected to the piston are also non-rotatably connected to the torque member or the members that are non-rotatably connected to the torque member. A disc brake characterized by sliding engagement. 2. In the disc brake according to claim 1, the fixed torque member 40 has a non-circular hole 29, and the piston 24 or a member 26 non-rotatably connected to the piston,
28 is slidably but non-rotatably engaged with the non-circular hole 29. 3. The disc brake according to claim 1 or 2, wherein the members non-rotatably connected to the piston are friction pad assemblies 26 and 28. 4. In the disc brake according to claim 2 or 3, the piston 24 with a non-circular cross section and the non-circular cross-sectional hole 29 of the torque member have the same cross-sectional dimensions, and the piston fits into the hole. Has disc brakes. 5 In the disc brake according to claim 4, the piston chamber 2 is arranged around the piston 24 having a non-circular cross section.
2 and a non-circular cross-section hole 29 of the fixed torque member with a flexible seal 45. 6. In the disc brake according to claim 2 or 3, the friction pad assemblies 26 and 28 are slidably fitted into the holes 29 having a non-circular cross-section, and the non-circular cross-section holes have a non-circular cross-section. A disc brake with a larger cross-sectional dimension than the piston 24. 7 Any one of claims 1 to 6
In the above disc brake, the piston having a non-circular cross-section and the piston chamber having the same cross-section form an actuator of a caliper. 8. In the disc brake according to claim 7, the rim 1 defining the piston chamber 22 of the caliper 10
8 is located on said one side of the disk 12, and a piston 24 of non-circular cross section acts directly on one friction pad assembly 26, 28 on said side of the disk and on the other side by reaction sliding of the caliper on said opposite side of the disk. friction pad assembly 27
, 30, the torque member 40 acts indirectly on the disk 1
Friction pad assemblies 26 and 28 on one side of the
The friction pad assembly 26, 28 is non-rotatably connected to a piston 24 having a non-circular cross-section. 9. In the disc brake according to claim 8, the friction pad assembly 26, 2 on the one side of the disc 12
8 and the piston 24 having a non-circular cross section have the same or similar shapes. 10. The disc brake according to any one of claims 1 to 9, wherein the friction pad assembly 27, 30 on the opposite side of the disc is attached to the rim 16 on the opposite side of the disc of the caliper 10. Disc brakes supported by. 11. A disc brake according to any one of claims 1 to 10, wherein the torque member has a rim 42 located on said opposite side of the disc, and a friction pad assembly 27 on said opposite side of the disc. , 30 is the rim 4
2. A disc brake supported in a non-circular cross-section hole 21 of 2. 12 In the disc brake according to any one of claims 1 to 11, the friction pad assemblies 27 and 30 on the opposite side of the disc 12 are attached to the caliper 10.
Disc brakes pinned to. 13. A disc brake according to any one of claims 1 to 12, wherein at least the friction pad assemblies 26, 28 on the inner side of the disc are made of plastic material. 14. A disc brake according to any one of claims 1 to 13, wherein the two friction pad assemblies 26, 28: 27, 30 have the same shape.