JPH0517967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc brake using a combination caliper that has excellent caliper manufacturability and can easily cope with increases and decreases in brake capacity. Note that the combination caliper referred to in the present invention is one in which a plurality of divided parts are fastened together to form one caliper.

[Conventional technology and its problems]

A disc brake with a large braking capacity employs a method in which a plurality of actuators for pressing a friction material, such as pistons, are arranged in the circumferential direction of the disc, and these are assembled into a single caliper. This type of disc brake is generally referred to as a multi-pot type, but in a so-called actuator-opposed type disc brake, in which a pair of friction materials that sandwich the disc rotor are pressed separately by opposing actuators, the number of actuators in the rotor circumferential direction is If the number is increased, the size and weight of the caliper become very large, making casting, machining, assembly, etc. thereof difficult. For example, in the case of disc brakes installed on large industrial vehicles, it is quite possible that the weight of the caliper exceeds 100 kg, and in such cases, the manufacturability of the caliper becomes extremely poor and the manufacturing cost increases significantly. do.

In addition, conventional disc brakes have the disadvantage that the number of actuators that can be housed in the caliper is fixed, so the brake capacity cannot be increased or decreased, and the types of vehicles equipped with the disc brakes are limited to a narrow range.

Note that there is already a technology that molds the inner caliper and outer caliper separately and bolts them together to form a single caliper, but in the case of a heavy caliper, simply dividing it into two makes it difficult to manufacture. This technology is not cost efficient, and it is not possible to change the brake capacity using this technology.

Therefore, the present invention provides a combination caliper type disc brake that eliminates the above-mentioned problems.

[Means for solving problems]

The disc brake of the present invention that solves the above problems has a symmetrical torque receiving surface that abuts the side surface of the back plate of the friction material at the front and back in the circumferential direction of the disc with reference to the radial axis of the disc, and further includes: A plurality of torque receiving members each having a disk passage groove in the center of the disk in the axial direction of the disk, and two adjacent torque receiving members arranged at a constant pitch in the circumferential direction of the disk are placed on one end surface of the disk. and a pair of opposing cylinders connected to each other on the other end side, an actuator for pressing the friction material built into each cylinder, a holding pin for the friction material suspended between the opposing cylinders, and a pair of opposing cylinders facing the disk. The friction member is inserted between the adjacent torque receiving members and supported by the holding pin so as to be slidable in the disk axial direction.

In this way, by configuring one caliper by combining multiple parts, the weight of the individual torque receiving members and cylinders can be reduced, and the weight of these two, the actuator, the friction material, and its holding pin can be reduced. Since they have the same shape and size, they can be manufactured using the same equipment, resulting in very high productivity and mass production, which reduces manufacturing costs.

Furthermore, it is also possible to change the brake capacity by increasing or decreasing the number of connections between the torque receiving member and the cylinder.

Furthermore, when two or more torque receiving members are combined, the torque receiving members between cylinders arranged in the circumferential direction are commonly used for two sets of torque receiving members of opposing friction materials, so the size of the brake can be kept relatively small. The installation space is also small.

〔Example〕

Examples are given below. In the brake of the present invention, at least two torque receiving members may be connected by cylinders, but the attached drawing shows a six-pot type brake in which four torque receiving members are connected by a total of six cylinders.

Reference numeral 1 in FIGS. 1 to 3 indicates a torque receiving member;
2 is a cylinder, 3 is a fastening bolt between the cylinder and the torque receiving member, 4 is a piston assembled in the cylinder, 5 is a holding pin of friction material, 6 and 6' are friction materials facing each other with disk D in between; 7 is a piston seal having a piston retraction function, 8 is a dust boot that seals the opening of the cylinder, and 9 is a dust cover fixed with bolts 10.

The torque receiving member 1 has a symmetrical torque receiving surface 1a on the left and right sides (front and back in the circumferential direction of the disk) with respect to the radial axis C of the disk D, and has a torque receiving surface 1a on the symmetrical shape at the center in the axial direction of the disk as shown in FIG. A disk passage groove 1b as shown in FIG. It is considered a flat surface because of this. These torque receiving members are arranged at regular pitches in the circumferential direction of the disk as shown in FIG. 2 are connected to each other. Therefore, as shown in the figure, even when two or more torque receiving members are used, they are all integrally connected to form one caliper.

Next, the friction members 6 and 6' are assembled to each cylinder so that there is a slight gap between adjacent torque receiving members, and the retaining pin 5 suspended between the opposing cylinders is loosely inserted into the back plate. Supports sliding freely.

In addition, although the pair of friction materials are supported by one holding pin in the figure, the opposing friction materials may be supported by inserting a plurality of holding pins.

In addition, a dust cover 9 is bolted to an adjacent torque receiving member to close the opening on the outer periphery of the caliper.
is desirable, but not required.

Furthermore, the form of supply of hydraulic fluid to the hydraulic pressure chamber of each cylinder is not particularly limited. However, like the illustrated brake, there is a liquid inlet 11 in the torque receiving member 1 at one end.
and a flow path 12 extending from there to the inner side end face and the outer side end face and from the endmost cylinder hydraulic pressure chamber.
(Fig. 5), and on the other hand, the remaining torque receiving members except for the torque receiving member at the other end are connected to a flow path 12' leading to the hydraulic pressure chamber of the adjacent cylinder. A communication passage 14 is provided, and the passages 12 and 13 and 12' and 14 are connected to the seal ring 1.
5, the hydraulic fluid supply points for the hydraulic pressure chambers of all the cylinders can be concentrated in one place, leading to the simplification of piping. Number 1 in Figure 1
6 is an air bleeder.

〔effect〕

In the disc brake of the present invention as described above, the caliper is a combination of a plurality of torque receiving members each having a symmetrical torque receiving surface and a single-pot cylinder that connects adjacent torque receiving members on the inner side and the outer side. This structure reduces the weight of individual parts. In addition, the torque receiving members, cylinders, pistons, friction materials, and their holding pins that are used in multiple pieces all have the same shape and size, so productivity is excellent, and manufacturing costs are also reduced due to the mass production effect. .

Furthermore, since the number of actuators can be increased or decreased, the brake capacity can also be changed freely.

Furthermore, since the intermediate torque receiving member is used in common for the torque receiving members of the two sets of friction materials, the brake dimensions are not so large, and compared to the case where two brakes are installed side by side in the circumferential direction, the installation It also takes up less space.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the brake of the present invention, FIG. 2 is a partial view of the brake as seen from the outer periphery of the disk toward the center of the disk, and FIG. 3 is a view along the - line in FIG. FIG. 4 is a perspective view of the torque receiving member, and FIGS. 5 and 6 are cross-sectional views showing the connecting portion of the hydraulic fluid supply path. 1...Torque receiving member, 1a...Torque receiving surface, 1b...Disc passage groove, 1c...Mounting portion,
2... Cylinder, 3... Fastening bolt, 4... Piston, 5... Holding pin, 6, 6'... Friction material, 9
...Dust cover.

Claims (1)

[Scope of Claims] 1. It has a symmetrical torque receiving surface that abuts the side surface of the back plate of the friction material at the front and back in the circumferential direction of the disk with reference to the radial axis of the disk, and furthermore, A plurality of torque receiving members each having a disk passage groove in the center, and two adjacent torque receiving members arranged at a constant pitch in the circumferential direction of the disk, respectively on one end surface side and the other end surface side of the disk. A pair of opposing cylinders to be connected, an actuator for pressing the friction material built into each cylinder, a holding pin for the friction material suspended between the opposing cylinders, and the adjacent torque receiving members facing the disk. A disc brake using a combination caliper comprising a pair of friction materials inserted between the calipers and supported by the holding pin so as to be slidable in the axial direction of the disc. 2. The device according to claim 1, characterized in that an opening formed between the two adjacent torque receiving members and the cylinder that connects them on the outer periphery of the disk is covered with a dust cover. Disc brake using a combination caliper.