JPH07196066A - Hydraulic brake device - Google Patents

Abstract

(57) [Summary] [Purpose] The initial position of the master cylinder piston should not be affected by the wire length adjustment. [Structure] A master cylinder 7 is formed integrally with a brake caliper 6, and a lever for activating a piston 15 of the master cylinder is composed of a first lever 8 and a second lever 10. The first lever 8 is rotated in the operating direction by the wire 9, and is rotated in the opposite direction by the first return spring 13.
The second lever 10 is connected to the first lever 8 by the gap adjusting means 11, and integrally rotates only when the first lever 8 rotates in the actuating direction, and independently of the first lever 8 when the brake is not actuated. The second return spring 27 causes the stopper portion 20 of the mounting portion 16 to rotate until it comes into contact with the rear surface wall 22 of the reserve tank 21, so that the initial rotation position is always constant, and as a result, the initial position of the piston 15 is also constant. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a master cylinder integrated hydraulic brake device used in a motorcycle or the like.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 61-115788 discloses a hydraulic brake device in which a brake caliper is integrally provided with a master cylinder, and a piston of the master cylinder is operated by a lever which is rotated by a wire operation. ing.

[0003]

By the way, in the above structure, the initial turning position of the lever is adjusted by adjusting the length of the wire. Therefore, if the initial rotation position of the lever changes, the initial position of the piston in the master cylinder also changes, and if the proper adjustment amount is incorrect when adjusting the wire length, the flow of the brake fluid will be adversely affected. There is a risk. Therefore, an object of the present invention is to prevent the initial position of the piston of the master cylinder from changing by the lever.

[0004]

In order to solve the above problems, a hydraulic brake device according to the present invention is provided with a master cylinder integrally with a brake caliper and a lever for operating a piston of the master cylinder. In a hydraulic brake device including a lever for rotating operation with a wire and an initial position adjusting means for the lever, the lever is attached to a first lever to which one end of the wire is connected and to be rotatable coaxially with the first lever. And a second lever that actuates the piston of the master cylinder.
The second lever is connected to the first lever so as to be integrally rotatable only when the first lever rotates in the brake operating direction, and a gap adjusting means is interposed between the first lever and the second lever. When the first lever is in the non-brake state, the second lever is urged to rotate in the non-brake operating direction regardless of the position of the first lever, and is returned to a predetermined initial position by the stopper provided in the second lever. It is characterized in that a returning means is provided.

[0005]

When the first lever is rotated in the non-operating direction of the brake without operating the wire, the second lever is rotated in the non-operating direction of the brake by the initial position returning means regardless of the first lever. , Stops at a predetermined initial rotation position by the stopper portion. Therefore, the initial position of the master cylinder piston is always constant.

When the wire is operated, the first lever rotates in the brake operating direction, and at this time, the second lever also rotates in the brake operating direction together with the first lever.
The second lever actuates the piston of the master cylinder to generate hydraulic pressure in the master cylinder and apply the brake. Further, the initial rotation position of the second lever can be adjusted by adjusting the space adjusting means.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment will be described with reference to FIGS. FIG. 2 is a diagram showing a side surface shape of a front wheel hydraulic brake device portion of a motorcycle to which the present embodiment is applied, in which a front wheel 3 is supported by an axle 2 at a lower end of a front fork 1 and a brake disc is provided on a side portion thereof. 4 is attached.

The caliper bracket 5 is attached to the stays 1a and 1b which integrally project from the rear portion of the lower end of the front fork 1.
The brake caliper 6 is attached via.

A master cylinder 7 is integrally provided in the brake caliper 6, and a first lever 8 for indirectly actuating a piston (described later) of the master cylinder is rotatably attached to the brake caliper 6. A wire 9 extending from the handle (not shown) side is used for turning operation.

The second lever 1 for directly actuating the piston of the master cylinder is coaxial with the first lever 8.
0 is supported, and the distance between the first lever 8 and the second lever 10 can be adjusted by the distance adjusting means 11.

FIG. 1 is an enlarged side view showing a partial cutaway of the hydraulic brake device, and FIG. 3 is a rear view (direction of arrow A) of the hydraulic brake device.
FIG. 4 is a partially cutaway plan view (direction of arrow B).

As shown in these figures, the first lever 8 is rotatably attached to the brake caliper 6 by a shaft 12 and is actuated by a first return spring 13 in a non-brake operating direction (counterclockwise direction in FIG. 1). Is urged to rotate.

The second lever 10 is rotatably mounted coaxially with the first lever 8 by a shaft 12, and the pressing portion 14 at the tip end thereof pushes the head portion 15a of the piston 15 of the master cylinder.

The other end of the second lever 10 forms a mounting portion 16, where a joint bolt 17 pivotally attaches to a connecting end portion 19 of an adjusting bolt 18, and a front wall forms a stopper portion 20 to form a brake caliper. The rear surface wall 22 of the reserve tank 21 which is integral with 6 is abutted.

The free end side of the adjusting bolt 18 has a first
The intermediate portion of the joint pin 24, which is inserted between the connecting portions 23 provided at the upper end portion of the lever 8 having a bifurcated shape, passes through the through hole 25 formed in the diametrical direction, and the adjusting nut 26 is provided on the tip side. Is mounted and the gap between the joint bolt 17 and the joint pin 24 is adjusted by adjusting the adjusting nut 26.

A second return spring 27 is provided around the adjusting bolt 18 between the joint pin 24 and the connecting end portion 19, and the second return spring 2 is provided.
The second lever 10 is constantly urged to rotate in the non-brake actuating direction by 7 to press the stopper portion 20 against the rear wall 22. The second return spring 27 and the stopper portion 20 constitute an initial position returning means for the second lever 10.

The master cylinder 7 is in communication with the reserve tank 21 through a primary port 30 and a main port 31, and is in communication with a caliper cylinder 34, in which a caliper piston 33 is accommodated, through a projecting port 32.

A piston 15 is slidably accommodated in the master cylinder 7, and is urged by a return spring 35 in a direction in which it is pushed out of the master cylinder 7 during operation.

In the non-actuated position shown in FIG. 1, the primary cup 36 of the piston 15 has the primary port 3
Located between 0 and main port 31, main cup 37
Is at a position separated from the main port 31 by the total stroke of the piston 15.

As is apparent from FIG. 4, a pair of brake pads 40 provided on the brake caliper 6 sandwiches the brake disc 4 and is brought into pressure contact with the caliper piston 33. It is attached to a support plate 42 which is attached to a guide pin 41 so as to be movable in the axial direction.

One support plate 42 is the caliper piston 3
The brake caliper 6 is configured to move in the axial direction with respect to the slide pin 43 when the caliper piston 33 presses the support plate 42.

Reference numeral 44 in FIG. 1 is a guide for the wire 9, and unlike the prior art, no means for adjusting the length of the wire 9 is provided here.

Next, the operation of this embodiment will be described. In the brake non-operating state of FIG. 1, the second lever 10 is rotated counterclockwise by the second return spring 27, and the stopper portion 20 abuts against the rear wall 22 to stop the rotation. The pressing portion 14 of is the piston 15
The head portion 15a is not pressed.

Therefore, since the initial rotation position of the pressing portion 14 is positioned at the stop position of the stopper portion 20, it is always constant, and the piston 15 is fixed to the return spring 3.
5, the primary cup 36 surely returns to a predetermined initial position where it does not block the primary port 30.
Therefore, the brake fluid in the caliper cylinder 34 surely returns to the master cylinder 7, and the pair of brake pads 40 (FIG. 4) open the brake disc 4 rotatably.

At this time, the first lever 8 is rotated counterclockwise by the first return spring 13, but the second lever 10 is not affected by this rotation and the stopper portion 20 contacts the rear wall 22. It can be rotated to a predetermined stop position in contact therewith.

The initial turning position of the first lever 8 is adjusted by rotating the adjusting nut 26, which adjusts the distance between the joint bolt 17 and the joint pin 24, and consequently the length of the wire 9. Although adjustment is performed, the initial rotation position of the second lever 10 is also constant at this time regardless of the second lever 10.

Therefore, even if the initial rotation position of the first lever 8 changes due to the adjustment of the length of the wire 9, the second lever 10 always maintains a constant initial rotation position, and as a result, the piston 15 also. Since a constant initial position is maintained, the brake fluid can be reliably returned.

When the wire 9 is pulled in the direction of arrow C in FIG. 1 during braking, the first lever 8 rotates in the clockwise direction, and at the same time the second lever 10 connected by the adjusting bolt 18 moves. Rotate clockwise as one.

Therefore, the pressing portion 14 of the second lever 10 pushes the head portion 15a of the piston 15, and the piston 15 is pushed inward of the master cylinder 7 against the return spring 35, so that hydraulic pressure is generated. The caliper cylinder 34 is operated, and a pair of brake pads 40 are brought into sliding contact with the side surfaces of the brake disc 4 for braking.

[0030]

According to the present invention, when the first lever is rotated in the non-operating direction of the brake, the second lever is rotated by the initial position returning means in the non-operating direction of the brake independently of the first lever. By moving and positioning the stopper portion, it comes to a predetermined initial rotation position, so that its position is always constant, and correspondingly, the piston of the master cylinder can also always return to a constant initial position.

When the wire is operated, the first lever rotates in the brake operating direction, and at this time, the second lever integrally rotates in the brake operating direction. Therefore, the piston of the master cylinder is operated to operate the master cylinder. It can generate hydraulic pressure inside and apply the brakes. In addition, although the initial rotation position of the first lever can be adjusted by adjusting the interval adjusting means, the second lever can also maintain the predetermined initial rotation position regardless of the first lever at this time.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an embodiment.

FIG. 2 is a front side view of the motorcycle to which the embodiment is applied.

FIG. 3 is a direction view of arrow A in FIG.

FIG. 4 is a direction view of arrow B in FIG.

[Explanation of symbols]

3: front wheels, 4: brake disc, 6: brake caliper, 7: master cylinder, 8: first lever, 9: wire, 10: second lever, 11: space adjusting means, 12:
Shaft, 14: pressing portion, 15: piston, 17: joint bolt, 18: adjusting bolt, 20: stopper portion, 24: joint pin, 27: second return spring

Claims (1)

[Claims] 1. A hydraulic brake comprising a brake caliper integrally provided with a master cylinder, a lever for operating a piston of the master cylinder, the lever being pivoted by a wire, and means for adjusting an initial position of the lever. In the device, the lever is composed of a first lever to which one end of a wire is connected and a second lever which is rotatably mounted coaxially with the first lever and operates a piston of a master cylinder. Is connected to the first lever so as to be integrally rotatable only when the first lever rotates in the brake operating direction, and a gap adjusting means is interposed between the first lever and the second lever. When the non-brake is operating, the second lever is urged to rotate in the non-brake operating direction regardless of the position of the first lever, and the stopper provided on the second lever Hydraulic braking apparatus, characterized by comprising an initial position returning means for returning to the predetermined initial position by.