JP3433832B2 - Hydraulic brake device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic brake device integrated with a master cylinder used for motorcycles and the like. 2. Description of the Related Art Japanese Patent Application Laid-Open No. 61-115788 discloses a hydraulic brake device in which a master cylinder is integrally provided with a brake caliper, and a piston of the master cylinder is operated by a lever which rotates by wire operation. It is shown. [0003] In the above structure, the initial rotation position of the lever is adjusted by adjusting the length of the wire. For this reason, when the initial rotation position of the lever changes, the initial position of the piston in the master cylinder also changes, and an incorrect adjustment amount when adjusting the length of the wire adversely affects the flow of the brake fluid. 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 being changed 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 the hydraulic brake device provided with a lever for pivotally operating the lever and having an initial position adjusting means for the lever, the lever is rotated coaxially with the first lever to which one end of the wire is connected. A second lever, which is freely mounted and operates 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 operation direction, and a distance adjusting means is interposed between the first lever and the second lever. When one lever is in the non-braking operation, an initial position in which the second lever is rotationally urged in the non-braking operation direction regardless of the position of the first lever and is returned to a predetermined initial position by a stopper provided in the second lever. A return means is provided. When the wire is not operated and the first lever is turned in the direction of non-operation of the brake, the second lever is moved by the initial position return means in the direction of non-operation of the brake independently of the first lever. It turns and stops at a predetermined initial turning position by the stopper portion. Therefore, the initial position of the piston of the master cylinder 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 together with the first lever in the brake operating direction.
The second lever operates the piston of the master cylinder to generate hydraulic pressure in the master cylinder and apply a brake. Further, by adjusting the interval adjusting means, the initial rotation position of the second lever can be adjusted. An embodiment will be described with reference to FIGS. 1 to 4. FIG. 2 is a diagram showing a side view of a front wheel hydraulic brake device portion of a motorcycle to which the present embodiment is applied. A front wheel 3 is supported by an axle 2 at a lower end of a front fork 1 and a brake disk is provided on a side portion thereof. 4 are attached. [0008] Caliper brackets 5 are provided on stays 1a and 1b which protrude integrally from the rear portion of the lower end of the front fork 1.
The brake caliper 6 is mounted via the. A master cylinder 7 is provided integrally with the brake caliper 6, and a first lever 8 for indirectly operating a piston (described later) of the master cylinder is rotatably attached to the brake caliper 6. The wire 9 is rotated by a wire 9 extending from a handle (not shown). Further, the second lever 1 for directly operating the piston of the master cylinder coaxially 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 the hydraulic brake device partially cut away, FIG. 3 is a rear view thereof (in the direction of arrow A),
FIG. 4 is a partially cutaway plan view (in the direction indicated by the arrow B). As shown in these figures, the first lever 8 is attached to the brake caliper 6 so as to be rotatable about a shaft 12, and the first return spring 13 causes the non-braking operation direction (counterclockwise direction in FIG. 1). Is biased to rotate. The second lever 10 is rotatably mounted coaxially with the first lever 8 by means of a shaft 12 so that a pressing portion 14 at the tip thereof pushes a head 15a of a piston 15 of a master cylinder. The other end of the second lever 10 forms a mounting portion 16, which is connected to a connecting end 19 of an adjusting bolt 18 by a joint bolt 17, and a front wall forms a stopper portion 20 to form a brake caliper. The abutment 6 is in contact with a rear wall 22 of a reserve tank 21. The free end side of the adjusting bolt 18 is
The intermediate portion of the joint pin 24 passed between the connecting portions 23 provided at the bifurcated upper end of the lever 8 passes through a through hole 25 formed in the diameter direction, and an adjust nut 26 The gap between the joint bolt 17 and the joint pin 24 is adjusted by adjusting the adjust nut 26. A second return spring 27 is provided around the adjusting bolt 18 and between the joint pin 24 and the connecting end 19.
7, the second lever 10 is constantly urged to rotate in the non-brake operating direction to press the stopper portion 20 against the rear wall 22. The second return spring 27 and the stopper 20 constitute an initial position return means for the second lever 10. The master cylinder 7 communicates with the reserve tank 21 through a primary port 30 and a main port 31 and communicates through a projection 32 into a caliper cylinder 34 in which a caliper piston 33 is housed. A piston 15 is slidably housed in the master cylinder 7, and is urged by a return spring 35 in a direction to be pushed out of the master cylinder 7 during operation. In the inoperative position shown in FIG. 1, the primary cup 36 of the piston 15 is
0 and the main port 31
Is located at a position away from the main port 31 by the entire stroke of the piston 15. As is apparent from FIG. 4, a pair of brake pads 40 provided on the brake caliper 6 are pressed by a caliper piston 33 with the brake disc 4 interposed therebetween. It is attached to a support plate 42 which is attached to the guide pin 41 so as to be movable in the axial direction. One of the support plates 42 is a caliper piston 3
The brake caliper 6 moves 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 denotes a guide for the wire 9, which is different from the conventional one, in which a length adjusting means for the wire 9 is not provided. Next, the operation of this embodiment will be described. In the non-operating state of the brake shown in FIG. 1, the second lever 10 is rotated counterclockwise by the second return spring 27 and stops rotating when the stopper portion 20 comes into contact with the rear wall 22. Of the piston 15
Is in a non-pressed state. For this reason, the initial rotation position of the pressing portion 14 is always fixed since it is positioned at the stop position of the stopper portion 20, and the piston 15 is
5 to ensure that the primary cup 36 returns to a predetermined initial position where the primary port 30 is not blocked.
Therefore, the brake fluid in the caliper cylinder 34 returns to the master cylinder 7 without fail, and the pair of brake pads 40 (FIG. 4) open the brake disc 4 so as to be freely rotatable. 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 rotate to a predetermined stop position where it contacts. The initial rotation position of the first lever 8 is adjusted by rotating the adjustment nut 26, thereby adjusting the distance between the joint bolt 17 and the joint pin 24. As a result, the length of the wire 9 is adjusted. Adjustment is performed, but also at this time, the initial rotation position of the second lever 10 is constant 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 moves. Since the constant initial position is maintained, the return of the brake fluid can be ensured. When the brake 9 is operated, when the wire 9 is pulled in the direction of arrow C in FIG. 1, the first lever 8 rotates clockwise, and at the same time, the second lever 10 connected by the adjustment bolt 18 is turned. Together they rotate clockwise. As a result, the pressing portion 14 of the second lever 10 presses the head 15a of the piston 15, and the piston 15 is pushed into the master cylinder 7 against the return spring 35, so that hydraulic pressure is generated. Then, the caliper cylinder 34 is operated, and a pair of brake pads 40 slide on the side surface of the brake disc 4 to apply braking. According to the present invention, when the first lever is pivoted in the non-operation direction of the brake, the second lever is not operated by the initial position return means independently of the first lever. In the direction, and the predetermined initial rotation position is obtained by the positioning of the stopper portion. Therefore, the position is always constant, and accordingly, the piston of the master cylinder can always return to the constant initial position. . When the wire is operated, the first lever rotates in the brake operating direction. At this time, the second lever is integrally rotated in the brake operating direction. It can generate hydraulic pressure inside and apply brakes. Also, by adjusting the distance adjusting means, the initial rotation position of the first lever can be adjusted. Even at this time, the second lever can maintain the predetermined initial rotation position regardless of the first lever.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway side view of the embodiment. FIG. 2 is a front side view of a motorcycle to which the embodiment is applied. FIG. 3 is a direction indicated by an arrow A in FIG. FIG. 4 is a view in the direction of arrow B in FIG. 1 [Description of symbols] 3: Front wheel, 4: Brake disc, 6: Brake caliper, 7: Master cylinder, 8: First lever, 9: Wire, 10: No. 2 levers, 11: interval adjusting means, 12:
Shaft, 14: pressing portion, 15: piston, 17: joint bolt, 18: adjust bolt, 20: stopper portion, 24: joint pin, 27: second return spring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-305474 (JP, A) JP-A-61-115788 (JP, A) Japanese Utility Model Application 58-46690 (JP, U) Japanese Utility Model Utility Model 59- 47590 (JP, U) Japanese Utility Model Showa 60-13879 (JP, U) Japanese Utility Model Showa 62-8178 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62L 3/00-3 / 02

Claims (1)

(57) [Claims 1] A master cylinder is integrally provided with a brake caliper, a lever for operating a piston of the master cylinder is provided, and the lever is rotated by a wire and the lever is operated. In a hydraulic brake device having an initial position adjusting means, a lever is connected to 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. A second lever connected to the first lever so as to be integrally rotatable only when the first lever rotates in the brake operation direction, and a distance adjusting means provided between the first lever and the second lever. When the first lever is in the non-brake operation state, the second lever is rotated and urged in the non-brake operation direction regardless of the position of the first lever, and Hydraulic braking apparatus, characterized by comprising an initial position returning means for returning to the predetermined initial position by the stopper provided on the bar.