JPH082507Y2 - Disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a disc brake incorporating a parking brake mechanism.

(Prior Art) Conventionally, as an example of a disc brake incorporating a parking brake mechanism, friction pads are arranged on both sides of the brake disc, a piston for pressing the friction pad against the brake disc is provided on the caliper, and a piston is further provided on the caliper. A cam shaft to be operated is rotatably provided, and a brake lever that is connected to the hand lever in the driver's seat via a cable is attached to this cam shaft. Some have a spring.
According to this, by pulling the hand lever and rotating the brake lever, the friction pad is pressed against the brake disc via the piston to perform the parking brake operation, and when the parking brake is released, the spring force of the return spring is used. Return the brake lever to its original position.

In addition, as another disbrake, there is one in which a flange that is located between the brake lever and the return spring is provided in a stopper that restricts the rotation of the brake lever.

(Problems to be solved by the invention) By the way, in the above disc brake, when the parking brake is released, it is necessary for the brake lever to reliably return the piston to the original state by the spring force of the return spring. Muddy water, sand, etc. jumps up and enters these between the exposed brake lever and the return spring or between the brake lever and the flange, increasing the sliding resistance of the relevant part and hindering the reliable return of the brake lever. There was a risk of

To solve this problem, as shown in Japanese Utility Model Publication No. 1-7872, a cover member that covers the entire brake lever and the return spring is provided to prevent muddy water, sand, etc. from entering the sliding contact portion of the brake lever and the return spring. However, in this case, a cover member large enough to cover the brake lever and the entire return spring must be provided, which increases the size of the disc brake as a whole. Due to the above restrictions, this plan was difficult to apply.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a compact disc brake capable of reliably returning the brake lever to its original position without being affected by muddy water, sand, and the like.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention is fixed to a caliper, a brake lever attached to a cam shaft rotatably provided on the caliper and rotating the cam shaft. , A stopper that comes into contact with a protrusion formed on the brake lever and restricts rotation of the brake lever in the return direction, forms a coil, is fitted to the cam shaft adjacent to the brake lever, and has one end In a disc brake having a return spring that is locked to a stopper and the other end of the upper side is locked to a brake lever to apply a rotational force in a return direction centered on the cam shaft to the brake lever, A cover member is provided to cover a sliding contact portion with a flange provided on the spring or the stopper.

(Effect) Since the present invention is configured as described above, even if muddy water, sand, or the like splashes up on the sliding contact portion while the vehicle is traveling, the cover member blocks them, so that the flange provided on the brake lever and the return spring or the stopper. It can be prevented from entering the sliding contact portion with.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, a carrier 1 is fixed to a non-rotating portion of an automobile on one side of a disc 2 which rotates with wheels of the automobile, and a pair of friction pads 3 and 4 arranged on both sides of the disc 2 are slid on the carrier 1. The caliper 6 is slidably supported by the two slide pins 5 while being movably supported.

The caliper 6 is provided with a cylinder portion 7 and a protruding portion 8 which is bent and connected to the cylinder portion 7 at a substantially right angle. The protruding portion 8 has a cable guide 9 and a cover member described in detail later.
10 is fixed by bolts 11.

The arm portion 12 of the caliper 6 includes a disc 2 and a friction pad.
It extends above 3 and 4 and engages with the friction pad 4 at the other end. A cylinder 13 is formed in the cylinder portion 7 of the caliper 6, and two pistons are housed in the cylinder 13. The two pistons are engaged with each other by a gap adjusting member (not shown) arranged between the two pistons. The piston 14 shown in FIG. 1 is the outer piston, and the other inner piston (not shown) can directly actuate the friction pad 3.

The caliper 6 is provided with a cam shaft 15 which is rotatable in a direction orthogonal to the axis of the cylinder 13. A connecting rod 16 is provided between the cam shaft 15 and the piston 14, and the rotational movement of the cam shaft 15 is transmitted as the axial movement of the piston 14 via the connecting rod 16. A part of the cam shaft 15 projects to the outside of the caliper 6, and the projecting portion 17 is connected to a hand lever (not shown) in the driver's seat via a cable 19 connected to the cable locking portion 18 and is connected to the cable 19. A brake lever 20 for rotating the cam shaft 15 in the forward direction (direction of arrow A) by pulling is attached, and a coiled return spring 21 located above the brake lever 20 is fitted to the projecting portion 17. Has been done.

The return spring 21 has an upper end 22 on the brake lever 20,
Further, the lower end portions 23 are respectively locked by rod-shaped stoppers 25 having heads 24 planted in the caliper 6, and the brake lever 20 is constantly urged in the return direction (arrow B direction). There is. The lower portion of the lower end portion 23 of the return spring 21 is in sliding contact with the brake lever 20. Then, the cover member 10 formed in a box shape with a step made of stainless steel plate so as to cover the return spring 21 and the sliding contact portion 26 of the brake lever 20 is fixed to the projecting portion 8 of the caliper 6. There is.

The cover member 10 is located above the sliding contact portion 26 by inserting the stopper 25 into the mounting portion 27 interposed between the overhanging portion 8 of the caliper 6 and the cable guide 9 and the notch 28 formed in the central portion. A hanging eaves portion 29 and a connecting portion having a step connected to the attachment portion 27 and the eaves portion 29 as described from the side of the overhanging portion 8 to the upper side.
30 and first and second lateral cover portions 31, 32 which are vertically provided on the eaves portion 29 so as to be located on both sides of the sliding contact portion 26.

In addition, 33 is a protrusion formed on the brake lever 20,
The stopper 25 is brought into contact with the stopper 25 to restrict the return spring 21 from rotating in the return direction.

In the disc brake configured as described above, the protrusion 33 of the brake lever 20 is in contact with the stopper 25 by the spring force of the return spring 21 when the hand brake operation is not performed.

If you pull the hand lever in the driver's seat in this state, the cable
19 moves in the direction of arrow C. Along with this movement, the brake lever 20 is rotated in the arrow A direction against the urging force of the return spring 21, and accordingly, the cam shaft 15 is rotated in the same direction to move the piston 14 in the axial direction. It will be displaced to serve as a parking brake.

When the parking brake is released, the return spring 21
The brake lever 20 is rotated in the direction of arrow B by the spring force to return to the original stopped state.

Even if muddy water, sand, or the like jumps up on the sliding contact portion 26 while the vehicle is traveling, the cover member 10 can block them and prevent the sliding contact portion 26 from entering the sliding contact portion 26. The part 26 can be reliably rotated without being affected by muddy water or sand. In addition, the cover member 10
Since it is an integrally formed product, it is easy to mount and can be securely fixed with a simple fixing member. Furthermore, since the cover member 10 is configured to cover only the sliding contact portion 26, the overall size of the device can be made compact.

Further, since the cover member 10 is fixed to the caliper 6 together with the cable guide 9, the increase in the number of fastening members can be suppressed and the productivity can be favorably maintained as compared with fixing each separately.

It should be noted that the brake lever 20 may be lifted during operation, which may lift the return spring 21. In the conventional case, when the return spring is lifted, the return spring directly contacts the head of the stopper, the plating applied to the stopper is peeled off, and rust is easily generated. On the other hand, in the present embodiment, the return spring 21 comes into contact with the head 24 of the stopper 25 via the flat plate cover member 10,
24 is not easily scratched and rust-resistant, and return spring 21 is also rust-resistant. Further, since the cover member 10 is also made of stainless steel, it does not easily rust.

When used as a foot brake, the operator may step on the brake pedal in the driver's seat and supply pressure oil from a brake master cylinder (not shown) to both pistons in the cylinder 13. As a result, the inner piston in the cylinder 13 directly displaces the friction pad 3 and presses it against one side surface of the disc 2, and the caliper 6 receives this reaction force and displaces in the opposite direction to the inner piston to cause friction pad 4 to move. Disk 2
Press on the other side of the. This provides a braking effect.

The present invention can also be applied to a disc brake as shown in FIG. That is, in this one, the stopper 25
In the middle of the shaft 25a, the flange 25b is provided so as to be positioned between the brake lever 20 and the return spring 21 to separate them from each other and avoid their contact, and to prevent the brake lever 20 and the cam shaft 15 from coming off. Provided, brake lever 20 and flange 25b
A cover member 10 having the same structure as that of the above-described embodiment is provided so as to cover the sliding contact portion 25c. Since the operation of the device configured as described above is the same as that of the above-described embodiment, the description thereof is omitted.

(Effects of the Invention) As described above, even if muddy water, sand, or the like splashes up on the sliding contact portion while the vehicle is traveling, the cover member blocks the sliding contact between the brake lever and the return spring or the flange provided on the stopper. Since it can be prevented from entering the contact portion, the sliding resistance of the brake lever can be prevented from increasing, and the brake lever can be reliably rotated when the parking brake is released, so that a highly reliable disc brake can be provided. Further, since the cover member is configured to cover only the sliding contact portion, the disc brake can be made more compact than the conventional one that covers the whole.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention.
2 is a sectional view taken along the line I--I of FIG. 2, FIG. 2 is a plan view showing a main portion of a disc brake of an embodiment of the present invention, and FIG. 3 is a disc of an embodiment of the present invention. FIG. 4 is a rear view showing the brake, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, and FIG.
FIG. 6 is a perspective view showing a cover member used in the disc brake, and FIG. 6 is a sectional view showing another embodiment of the present invention. 6 ... Caliper, 10 ... Cover member, 15 ... Cam shaft, 20
…… Brake lever, 21 …… Return spring, 22 …… Upper end, 23 …… Lower end, 25 …… Stopper, 26 …… Sliding contact part, 33 …… Projection part.

Claims (2)

[Scope of utility model registration request] 1. A brake lever mounted on a cam shaft rotatably mounted on a caliper to rotate the cam shaft, and a brake lever fixed to the caliper and contacting a protrusion formed on the brake lever. And a stopper that restricts rotation in the return direction of the coil, is coil-shaped, is fitted to the cam shaft adjacent to the brake lever, one end is locked by the stopper, and the other end on the upper side is the brake lever. In a disc brake equipped with a return spring that is locked and applies a rotational force in the return direction centered on the cam shaft to the brake lever, a cover that covers the sliding contact portion between the brake lever and the flange provided on the return spring or the stopper. Disc brake characterized by having a member. 2. A brake lever mounted on a cam shaft rotatably mounted on a caliper and rotating the cam shaft, and a brake lever mounted on the caliper, one end of which is fixed and pulled by the brake lever. A cable guide that guides the cable that rotates the brake lever, a stopper that is fixed to the caliper and that abuts a protrusion formed on the brake lever to restrict the rotation of the brake lever in the return direction, forms a coil, and forms a brake. The camshaft is fitted adjacent to the lever, one end of which is locked by a stopper and the other end of the upper side is locked by the brake lever, which causes the brake lever to rotate in the return direction about the camshaft. In a disc brake equipped with an adding return spring, a cover that covers the sliding contact portion between the brake lever and the flange provided on the returning spring or the stopper. A disc brake in which a member is fixed to the caliper together with the cable guide.