JPS5840355Y2 - disc brake device - Google Patents

Description

[Detailed description of the invention] The present invention is a disc brake device, in particular, a friction pad facing one side of the brake disc is slid into a circular support hole provided in a brake caliper, and the brake The present invention relates to a device in which the caliper is provided with a hydraulic cylinder equipped with an operating piston that is slidably engaged with the support hole through a seal ring, and the friction pad is pressed toward the brake disc by the operation of the cylinder.

In the above-mentioned type of disc brake device, the friction speed between the friction pad and the brake disc is faster on the outer part of the brake disc than on the inner part in the radial direction, and due to the speed difference, the friction pad is rotated during braking. If torque is applied and the friction pad rotates due to the rotational torque, the braking effect on the brake disc will be significantly reduced.

In order to solve this problem, conventionally, as shown in Japanese Utility Model Application Publication No. 48-64675, a friction pad is provided with a stopper that engages with the brake caliper to prevent the pad from rotating. However, the conventional anti-rotation piece was only intended to prevent the rotation of the friction pad, and the rotation of the operating piston of the hydraulic cylinder for operating the friction pad was not restricted in any way.

However, the operating piston of the hydraulic cylinder described above may rotate within the support hole due to the flow pressure of pressure oil acting on its back surface, and this rotation may cause the seal ring on the outer circumference of the piston to be forcibly twisted or pulled. This deformation and abrasion are likely to occur, and there is a risk that oil leakage from the hydraulic cylinder may occur due to the deformation and abrasion.

The present invention was proposed in view of the above, and it is possible to simultaneously prevent the rotation of the actuating piston of the hydraulic cylinder for pad actuating by a rotation preventing piece for the friction pad.
The purpose is to provide the above-mentioned disc brake device with an extremely simple structure, and its features are that a 1-ton actuating screw is fixed to the back side of the lining of the friction pad and serves as the back metal of the friction pad, and the lining The base of the locking piece is held between the brake caliper and the actuating piston, and the tip of the locking piece is engaged with a locking groove provided in the brake caliper and extending in the radial direction of the actuating piston.

An embodiment in which the present invention is applied to a disc brake for a vehicle will be described below with reference to the drawings. 1 is a channel-shaped bracket fixed to the vehicle body F, and directly below the center of the bracket is a brake disc D that rotates together with the wheels to be braked. will be placed.

The base of a brake caliper 2 that straddles a part of the brake disc D from the left and right is inserted into the inside of the bracket 1 with some play left and right, and a pair of front and rear sliding holes 3 are provided at the base.
, 3 are fitted with a pair of front and rear support shafts 4, 4 parallel to the axis of the brake disc D, and both ends of these support shafts 4, 4 are supported by the left and right side plates of the bracket 1.

The left and right arms 2a and 2b of the brake caliper 2, which straddles the brake disc D, are provided with fixed and movable friction pads 5 and 6, respectively, which face each other with the brake disc D in between.

The fixed friction pad 5 is composed of a back metal 7 and a lining 9 fixed thereto by rivets 8. The back metal 7 is positioned and engaged with a mounting hole 10 opened on the inner surface of the left arm portion 2a, and is attached to the left arm by a split pin 11. It is fixed to the portion 2a.

On the other hand, the movable friction pad 6 is connected to the operating piston 1 which also serves as a back metal.
2, and a lining 16 that is positioned on the front surface of the operating piston 12 by fitting the recess 13 and the projection 14, and is removably fixed with a screw 15,
The operating piston 12 is slidably fitted into a circular support hole 17a of a hydraulic cylinder 17 provided in the right arm portion 2b via a seal ring 18.

When the actuating piston 12 and the lining 16 are connected by the screw 15, the base of the locking piece 19 is held between them, and the screw 15 is passed through the base.

Further, the base portion is engaged with a positioning recess 20 formed on the back surface of the lining 16, thereby preventing the rotation stopper piece 19 from rotating around the screw 15.

The protruding end portion of the locking piece 19 is slidably engaged with a locking groove 21 provided in the right arm portion 2b of the brake caliper 2 and extending in the radial direction and sliding direction of the actuating piston 12.

Note that 22 in the figure is a hydraulic conduit connecting the hydraulic cylinder 17 and a brake mask cylinder (not shown).

Next, the operation of this embodiment will be explained. When pressure oil is supplied from the brake mask cylinder to the hydraulic cylinder 17 through the hydraulic conduit 22, the pressure causes the operating piston 12, that is, the movable friction pad 6 to move to the left in FIG. Then, the lining 16 is brought into pressure contact with the right side surface of the brake disc D.

Then, the reaction force causes the brake caliper 2 to move against the support shafts 4, 4.
The lining 9 is moved to the right together with the fixed friction pad 5 along the left side surface of the brake disc D.

Thus, the rotating brake disc D has both friction pads 5
6 and is braked by their frictional resistance.

During this braking, rotational torque acts on the movable friction pad 6 for the above-mentioned reason, but since the rotation stopper piece 19 fixed to the movable friction pad 6 is engaged with the rotation stop groove 21 of the brake caliper 2, the above-mentioned Movable friction pad 6 using rotating torque
rotation is prevented, and frictional resistance can be reliably applied to the brake disc D.

As described above, according to the present invention, the operating piston 12 of the hydraulic cylinder 17 provided in the brake caliper 2 for pressing the friction pad 6 toward the brake disc D is fixed to the back surface of the lining 16 of the friction pad 6. It also serves as the back metal of the friction pad 6, and the base of the locking piece 19 is sandwiched between the lining 16 and the operating piston 12, and the tip of the locking piece 19 is attached to the brake caliper 2. Since it is engaged with the locking groove 21 extending in the radial direction of the working piston 12, the locking piece 19 can simultaneously prevent not only the rotation of the friction pad 6 but also the rotation of the working piston 12 that presses it. Therefore, it is possible to prevent the deterioration of the braking effect due to the rotation of the friction pad 6, as well as suppress deformation and wear caused by twisting of the seal ring 18 due to the rotation of the actuating piston 12.
Oil leakage from the hydraulic cylinder 17 due to the deformation and wear can be prevented.

In addition, the rotation prevention piece 19 is sandwiched between the operating piston 12 and the lining 16 and does not require any special fixing member. Coupled with the effect that the actuating piston 12 is also used as the back metal of the friction pad 6, the overall structure of the device can be significantly simplified, which can greatly contribute to cost reduction.

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[Brief explanation of drawings]

FIG. 1 is a side view of a disc brake for a vehicle which is an embodiment of the present invention, FIG. 2 is a sectional view taken along line 1--2 in FIG. 1, and FIG. 3 is a rear view of the lining of the movable friction pad. 2... Brake caliper, 6... Movable friction pad as a friction pad, 12... Working piston, 16... Lining, 17...
...Hydraulic cylinder, 17a...Support hole, 18.
... Seal ring, 19 ... Stopper piece.

Claims (1)

[Scope of utility model registration request] A friction pad 6 facing one side of the brake disc D is slid into a circular support hole 17a provided in the brake caliper 2, and a seal is attached to the support hole 17a in the brake caliper 2 on the back side of the friction pad 6. In a disc brake device, a hydraulic cylinder 17 is provided with an operating piston 12 that is slidably engaged through a ring 18, and the friction pad 6 is pressed toward the brake disc D by the operation of the hydraulic cylinder 17. 12 is fixed to the back surface of the lining 16 of the friction pad 6 and also serves as the back metal of the friction pad 6, and the base of the rotation stopper piece 19 is sandwiched between the lining 16 and the actuating piston 12. 19 is engaged with a locking groove 21 provided in the brake caliper 2 and extending in the radial direction of the actuating piston 12.