JPS63653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automobile disc brake, in particular a type (hereinafter referred to as an open type) in which a pad member can be inserted and removed from an opening in a caliper even after the brake is installed on a wheel. The present invention relates to a disc brake having a caliper.

Conventional open-type calipers were made by dividing the entire caliper into two parts along a plane parallel to the rotor, and joining the resulting pieces together with bolts, as it was necessary to cut the inner surface of the cylinder during machining. .

Calipers are affected by the reaction force of the strong pressure applied to the pads during braking, as well as by the braking torque transmitted from the pads. Therefore, the two-piece type caliper described above depends only on the rigidity of the bolts, so the overall rigidity after assembly is insufficient, and the caliper becomes distorted during braking. This requires a large amount of brake fluid in the brake pedal, and as a result, the amount of pressure on the brake pedal is increased, giving the driver a sense of operational anxiety.At the same time, the brake pedal bottoms with low pedal effort, resulting in high braking force. The drawback was that there was no. Furthermore, as a negative effect due to insufficient rigidity, the correct pairwise relationship of the sliding portion of the caliper with respect to the two parallel pins that slidably support it may be disrupted. As a result, the slidability of the caliper on the pin during braking is not smooth, and even after the brake is released, the caliper continues to press the pad against the rotor surface, causing premature wear of the pad. In order to overcome this drawback, methods were taken such as increasing the number of bolts or increasing the diameter of the bolts, but even with these methods, it was not possible to obtain sufficient rigidity, and the weight and manufacturing cost were reduced. It lacked practicality due to additional drawbacks such as increased size.

In order to avoid the above-mentioned conventional drawbacks, the present invention forms the caliper into an integral structure, provides a through hole for inserting a tool in the wall surface opposite to the cylinder part for processing the inner surface of the cylinder during manufacturing, and furthermore, A pin for receiving a torque member is arranged on one side of the opening, the other side of the opening of the caliper is a solid part, and a part on the opposite side of the solid part, away from the solid part and parallel to the cylinder, is provided. Basically, a configuration is adopted in which a hole is provided to receive the pin of the torque member. In this configuration, the pin slide parts on both sides of the caliper opening are parallel but offset, so the guide length of the pin slide part can be ensured to be substantially long, and the pin slide parts on both sides of the caliper opening are parallel to each other. It is possible to minimize the inclination of the caliper and prevent uneven wear of the pads. In addition, since one side of the opening of the caliper is solid, the rigidity of the caliper is high, and since this solid part is placed on the exit side of the rotor rotation, which has a high pressing force on the pad, the strength of the caliper is increased. can be reasonably increased. The invention will be explained with reference to the following figures.

The torque member 1 on the left in FIG. 1 is attached to a non-rotating fixed part of a wheel of a motor vehicle by means of a bolt. Reference numeral 2 in FIGS. 2 and 3 indicates a bolt hole for mounting the same. A caliper 3 and pad members 4 and 5 are movably mounted on the torque member 1. The direction of the free movement is the vertical direction in FIG. 1, that is, the axial direction of the brake disc (not shown). The floating mounting structure is as described below.

A sleeve 6 is integrally formed with the torque member 1, as shown on the left side of FIG. Caliper 3 (Fig. 3) wraps this sleeve 6 from above.
A recess 27 having a substantially semicircular cross section is formed in the side wall 7 of the recess 27 . As shown on the left side of FIG. 1, a first pin 9 is fixed to the caliper by a threaded portion 10 in a recess 27 of the side wall 7 that is open to the torque member side. 6. The upper and lower ends of the first pin 9 are provided with boots 11.
covered with.

As shown on the right side of FIG. 1, the caliper 3 also has a right side wall 8 formed integrally therewith. The right side wall 8 has a different cross-sectional shape from the left side wall 7 as shown in FIG. As shown in FIG. 1, the caliper 3 is slidably engaged with a second pin 12 attached to the torque member 1 with a threaded end via a pusher 13. The shape of this side wall 8 is the shape of the caliper 3.
This is to ensure rigidity during braking,
This will be discussed further below.

As shown in FIG. 3, the inner pad member 5 is slidably fitted into the U-shaped interior of the torque member 1 in a direction perpendicular to the plane of the drawing.
As shown in the figure, the stepped portion 15 of the back plate 14 fits into the hole 16 of the caliper 3. A rotor (not shown) is located between both pad members 4 and 5,
Rotates with the wheels. As will be described later, pad members 4 and 5 are pressed against the rotor from both sides to perform braking. At that time, the torque acting on the inner pad member 5 is directly received by the torque member 1, and the torque acting on the outer pad member 4 is transmitted from the stepped portion 15 of the back plate to the caliper via the hole 16, and is transmitted to the caliper through the first and second pins. It is finally absorbed by the torque member 1 via 9 and 12. Both pad members have such a torque transmission structure, but this support structure is based on the left and right third pins 17, 1, as shown in FIGS. 1 and 3.
The elongated holes (Fig. 3) of the pins 8 are slidably fitted into the pins 17 and 18, and both ends of the pins 17 and 18 are tightly fitted into the front wall 19 and rear wall 20 of the caliper 3, as shown in Fig. 1. There is.

Reference numeral 21 shown at the lower center of FIG. 1 indicates a bleeder attachment port for air bleeding, and reference numeral 22 indicates a pipe attachment port for guiding braking pressure oil into the cylinder 23 of the caliper. A piston 24 slides within the cylinder. The piston 24 directly abuts and engages the back plate of the pad member 5. Note that 25 is a boot that covers the end of the piston. Also, 24a is the piston 24
and the cylinder 23.

Next, the operation will be explained. During braking, pressurized fluid is forced into the cylinder 23 from the pipe attachment port 22 shown in FIG. As a result, the inside of the cylinder is pressurized and the piston 24 directly presses the pad member 5,
This is pressed against the rotor. The reaction force at that time acts on the pad member 4 on the opposite side via the caliper 3. Therefore, the rotor is pinched by the pads from both sides and braked by friction. Padded member 5
The braking torque applied to the pad member 4 is directly transmitted and absorbed by the torque member 1 as described above, and the torque applied to the pad member 4 is eventually absorbed by the torque member 1 via the caliper 3.

Next, the features of the disc brake of the present invention will be explained.

As shown in FIGS. 1 and 3, the disc brake of the present invention is of an open type in which when the two pins 17 and 18 are removed as described above, both pad members can escape outward from the large opening 26 of the caliper. belongs to Further, the hole 16 shown in FIG. 4 has an inner diameter that matches that of the cylinder 23 shown in FIG. In order to make this hole 16, this hole 16 is formed together with the cylinder hole 23 using a core mold when making the cylinder material by casting. When the pad member 4 is to be locked in the hole 16 as shown in FIG. 1, the hole 16 is further finished by machining. Therefore, during cutting and polishing, the cylinder 23 is inserted through the hole 16.
A tool can be brought into contact with the inner surface. As a result, internal grinding is possible even if the entire caliper is constructed as one piece as shown. Therefore, although it is an open type caliper, which is a disadvantageous configuration for ensuring the rigidity of the caliper, the entire caliper has an integral configuration, so compared to the conventional open type caliper with a split piece fastening structure. Great rigidity can be obtained.

As shown in FIG. 1, the back plate 14 of the pad member 4
Since the stepped portion 15 is fitted into the hole 16, it has a circular shape with the same diameter as the hole 16, as shown in FIG. In order to save the labor of processing this circular stepped portion 15 into the back plate 14, a rectangular hole 16a having the same size as the back plate 14 is provided.
A caliper provided with the same is shown in FIG. 1a. The hole 16a is made by broaching.

In addition, when braking, by forming the caliper integrally like this, compared to the conventional caliper,
It has achieved sufficiently high rigidity.

In obtaining the stiffness of the caliper, the parts that most affect the stiffness are the side walls 7 and 8. Therefore, it is necessary to maximize the wall thickness of this part in order to increase the rigidity. However, it is necessary to provide a means for slidingly supporting the caliper 3 in this part, and the reasons for this are that it can be designed simply and that supporting the caliper near the center of gravity of the caliper is advantageous in terms of vibration strength. It is for this purpose.

Providing the sliding support means for the caliper at this side wall location is disadvantageous because it reduces the wall thickness of this portion, but it is unavoidable for the reasons mentioned above.

However, in the case of disc brakes with large cylinders used in large vehicles, etc., the first requirement is to obtain sufficient rigidity, so as shown in Figure 1,
One of the supporting means is provided at a position opposite to the rotor surface, and the side wall 8 is made sufficiently thick to further increase the rigidity.

All of the embodiments described above have an opening where the pad member can be easily attached and detached by pulling out two pins after the brake is installed on the vehicle.
Although it is a so-called open caliper, it has a one-piece structure, which provides great rigidity. Therefore, it can sufficiently withstand stresses such as pad member pressure reaction force or braking torque applied to the caliper during braking.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal sectional plan view of the caliper of the present invention, Fig. 1a is a longitudinal sectional view of a partially modified embodiment thereof, Fig. 2 is a front view thereof, and Fig. 3 is a sectional view taken along the line - in Fig. 1. 4 is a rear view of FIG. 3 and viewed in the reaction direction. 1... Torque member, 3... Caliper, 4, 5...
...pad member, 9, 12, 17, 18...pin,
23...Cylinder, 24...Piston.

Claims (1)

[Claims] 1. A torque member fixed on the wheel fixing part, a rotor that rotates integrally with the wheel, inner and outer pad members arranged on both sides of the rotor, and a torque member that is slidably provided on the torque member along the rotational axis direction of the rotor. The caliper is integrally formed in a bridge shape so as to straddle a part of the peripheral edge of the rotor and both pads located on both sides of the rotor, and has both pad members at the central straddling part. The caliper has a pressurizing cylinder that pressurizes the inner pad against the rotor and a piston that slides inside the cylinder, and a tool for machining the inner surface of the cylinder is inserted into the outer pad side of the caliper. The caliper has a through hole for processing,
The central straddling portion has a recess with a generally semicircular cross section open toward the torque member on one side of the opening, and a solid portion on the other side, and a first member supported by both ends of the recess of the caliper. A sleeve of the torque member is slidably fitted onto the pin, and a second pin is provided parallel to the first pin at a position away from the solid portion of the caliper, and the caliper is supported in a freely movable manner with respect to the torque member.
An open type caliper for an automobile disc brake, characterized in that torque acting on an inner pad member is transmitted to a torque member and torque acting on an outer pad member is transmitted to a caliper.