CN2398186Y - Mechanical Disc Brake - Google Patents

Abstract

A mechanical disc brake device is characterized in that a C-shaped groove is arranged on one side of a caliper, a ball seat with different slope change step surfaces is arranged in the caliper, a push rod penetrates through the ball seat to protrude out of the caliper and is sleeved with a return spring, then the push rod is connected with a crank connected with a brake cable, a plurality of balls are arranged in the middle of the opposite surfaces of the ball seat and the push rod, the push rod can reversely push the rotary inclined surface of the ball seat by the balls to generate axial displacement, and a brake pad clamp fixedly arranged at the inner side end of the push rod presses a brake disc to generate a braking effect.

Description

Mechanical Disc Brake

The utility model relates to a brake structure, in particular to a mechanical disc brake device with small transmission resistance and fast braking.

As shown in FIG. 1 , the conventional bicycle disc brake includes a clamp housing 1 , two clamp bases 2 , a push rod 3 and an eccentric pressure rod 4 . One side of the clamp housing 1 is provided with a C-shaped groove 101, and the top surface of the other side is formed with a warped cable fixing piece 102, and the two sides of the front section of the clamp housing 1 extend outward respectively. A support piece 103 with a circular hole is formed, and an opening 104 is formed on the front side of the clamp housing 1 , and a push rod groove 105 communicating with the C-shaped groove 101 is defined inwardly at the inner end of the opening 104 . The two clip seats 2 all have a brake block 201 and a metal sheet seat 202, and each clip seat 2 is respectively slid in and bonded laterally by the shallow grooves on both sides of the C-shaped groove 101, and is symmetrical to the push rod groove. The metal sheet seat 202 of 105 is affixed to the end of the push rod 3 . The push rod 3 has three steps of medium and large sizes. The head end 301 of the middle step of the push rod 3 is provided with an arc groove 301 ′, and the tail section 302 of the small step is provided with a return spring 303 . When the push rod 3 When inserted into the push rod groove 105, the ability of the push rod 3 to return to its original position can be provided. The eccentric pressing rod 4 is provided with an eccentric hole 401 in the axial direction of a cylinder, and can be pivotally arranged between the two supporting pieces 103 laterally, and its outer arc surface 402 is pressed against the head end 301 of the push rod 3 There is an arc groove 301', and the outer end of the eccentric pressure rod 4 extends outwards with a pull arm 403, which can be tightened by screws and connected to the end of the brake line. As shown in FIG. 2 , when the rider pulls the brake line and moves the pull arm 403 of the eccentric pressure rod 4 , the push rod 3 can be pushed by rotating the eccentric arc surface 402 of the eccentric pressure rod 4 to generate axial tension. Displacement pushes the brake block 201 affixed to the end of the push rod 3 toward the disc 5 and clamps and tightens to achieve the braking effect.

Although the aforementioned mechanical brakes in the past can indeed achieve the purpose of braking, they still have the following disadvantages during use:

1. For some types of vehicles specially used for mountaineering, performance or competition, because they have to go through rough and bumpy roads, or to overcome obstacles in various terrains and features, they often have to brake quickly, and the aforementioned disc Brake structure, although the eccentric amount of the eccentric push rod 4 can be used as the displacement stroke of the push rod 3, the eccentric push rod 4 is limited by the relatively gentle eccentric arc, so that the displacement of the push rod 3 per unit time ( That is, the speed) is fixed, so the brake speed that can be obtained still does not meet the above-mentioned vehicle type use requirements.

2. As far as the transmission mode of the aforementioned disc brake structure is concerned, the eccentric pressure rod 4 is pressed against the arc groove 301' of the push rod 3 by means of its outer arc surface 402, and there is a kind of "surface" between the two. Therefore, when the rider wants to achieve the braking effect, he must not only overcome the elastic force of the return spring 303, but also overcome the frictional resistance between the contact surface of the push rod 3 and the eccentric pressure rod 4, so as to drive the eccentric The pressure rod 4 rotates to achieve the braking effect. Therefore, the rider must apply a large force to pull the brake handle, which is laborious and inconvenient to use.

The purpose of the utility model is to provide a mechanical disc brake device with small transmission resistance and fast braking, which can meet the best mechanical benefits.

The mechanical disc brake device of the present utility model forms a C-shaped groove on one side of a caliper, which can be used for a brake disc to pass through, and a ball seat with a spiral surface is installed in the caliper, and a push rod is passed through. Protrude out of the caliper through the ball seat, and a return spring is sleeved, and then a crank connected to the brake line is connected, and several balls are installed between the ball seat and the push rod, and the push rod The ball can be pushed against the inclined surface of the ball seat to produce axial displacement, so that the brake block clip fixed at the inner end of the push rod can press the brake disc tightly to achieve the braking effect. The feature is that: the ball seat The spiral surface is located between several grooves recessed at equal intervals on the inner end surface of the ball seat. The spiral surface has different slope changes, and the slope of the spiral surface becomes gentler as it approaches the top. The outer diameter of the front section of the rod is reduced to form a shoulder, and a plurality of concave holes are recessed on the peripheral surface of the shoulder, so that the balls can be fixed, and the push rod and the ball seat jointly clamp the balls.

The mechanical disc brake device of the present utility model will be described in detail below through the preferred embodiment and the accompanying drawings. In the accompanying drawings:

Fig. 1 is an exploded schematic view of a bicycle disc brake in the past;

Fig. 2 is the schematic diagram of combined section action of conventional bicycle disc brake structure;

Fig. 3 is an exploded schematic diagram of a preferred embodiment of the utility model;

Fig. 4 is the combined sectional view of the preferred embodiment of the utility model;

Fig. 5 is a schematic diagram of the action of the preferred embodiment of the present invention.

As shown in FIGS. 3 and 4 , the mechanical disc brake device of the present invention includes a caliper 10 , a ball seat 20 , a push rod 30 , two clip seats 40 , a crank 50 and several balls 60 .

The caliper 10 is formed by joining a first housing 11 and a second housing 12, and the first and second housings 11, 12 are locked by two bolts 13, so that an opening is formed under the caliper 10. A C-shaped groove 14 facing downwards, and an accommodating space 111 with an open front end is formed inside the first housing 11. The ring wall of the accommodating space 111 is recessed with many long grooves 112, and the inner end is penetrated A perforation 113 of.

The ball 20 is approximately circular and can be installed in the accommodating space 111 . The circumferential surface of the ball seat 20 is protruded with a plurality of positioning parts 21 that can be embedded in the long groove 112 to position the ball seat 20, and the center of the ball seat 20 is provided with a shaft hole 22 coaxial with the through hole 113, A plurality of grooves 23 are recessed at equal intervals along the radial direction on the inner end surface, and a spiral surface 24 is formed between adjacent grooves 23. The spiral surface 24 is helically inclined and has different slope changes. In the embodiment, the spiral surface 24 further includes a first stepped surface 241 and a second stepped surface 242, the first stepped surface 241 is interposed between the second stepped surface 242 and the groove 23, and the first stepped surface 241 The slope of the stepped surface 241 is greater than the slope of the second stepped surface 242 .

The outer diameter of the front section of the push rod 30 is reduced to form a shoulder 31, and then a post 32 is extended outward in the axial direction, so that the post 32 is sequentially inserted through the shaft hole 22 and the through hole 113 to protrude out of the caliper. 10 outside, set a return spring 33 again. The circumferential surface of the shoulder 31 is provided with a plurality of concave holes 311 corresponding to the grooves 23, and the concave holes 311 can be used for fixing the balls 60, so that the balls 60 are moved by the push rod 30 and the ball seat. 20 co-clamping.

The two clip seats 40 are sheets with clips 41, and are installed on the opposite sides of the C-shaped groove 14 respectively, and the clip seats 40 symmetrical to the first housing 11 utilize a buckle The clip 42 is fixedly connected to the front end of the push rod 30 .

One end of the crank 50 is locked to the end of the post 32 by a bolt 51 , and the other end is connected to a brake line (not shown).

As shown in Figure 5, during use, when the rider pulls the brake handle and pulls the brake line, the crank 50 can be rotated, and at this time the push rod 30 fixed to the crank 50 can rotate integrally. At the same time, the ball 60 limited in the concave hole 311 of the push rod 30 will slide on the spiral surface 24 of the ball seat 20, and utilize the height difference that the spiral surface 24 has to promote the ball 60 to reverse. To push the push rod 30, so that the push rod 30 can produce a displacement towards the brake disc 70, so that the brake block 41 clamps and presses the brake disc 70 tightly to produce a braking effect. On the contrary, when the rider When the brake handle is released, the push rod 30 can be moved back to its original position (as shown in FIG. 4 ) by the compressed return elastic force of the return spring 33 to release the brake disc 70 .

Comparing the mechanical advantages of the conventional disc brake device and the utility model, from a mechanical point of view, both the conventional and the utility model use the displacement of the push rod 3, 30 to make the brake blocks 201, 41 press the brake disc 5, 70, however, the biggest difference between the two is that in the past, the push rod 3 and the eccentric pressure rod 4 belong to the "surface" contact friction, while the push rod 30 and the ball 60 of the present utility model belong to the "point" contact friction , its frictional resistance is relatively small, therefore, the utility model can achieve the braking effect with a small applied force.

Moreover, the utility model utilizes the first step surface 241 of the larger slope of the ball seat 20 to make the push rod 30 produce rapid displacement, so as to shorten the invalid displacement travel time of the push rod 30, and when the brake block 41 tends to When it is close to the brake disc 70, the ball 60 can just abut against the second step surface 242, as shown in FIG. , so that the rider can achieve the braking effect with a small force, that is to say, the utility model only needs to pull the brake handle for a small stroke to have the braking effect.

To sum up, the mechanical disc brake device of the present invention utilizes the first-step surface 241 with a larger slope through the spiral step surface 24 with a changing slope, so that the push rod 30 can achieve rapid displacement. In order to reduce the invalid travel time, the second step surface 242 with a smaller slope can enable the rider to achieve the braking effect with a smaller force, and can meet the requirements of fast braking, and can improve the safety of handling To ensure the safety of riders riding.

Claims (2)

1. A mechanical disc brake device, comprising a caliper forming a C-shaped groove on one side, a brake disc inserted in the C-shaped groove, and a ball mounted in the caliper and having a spiral surface Seat, a push rod that passes through the ball seat and protrudes out of the caliper. The push rod is sleeved with a return spring and connected to a crank. Several reverse push rods are installed between the ball seat and the push rod. The ball on the beveled surface of the ball seat and the axial displacement of the push rod is characterized in that: The spiral surface of the ball seat is located between a plurality of grooves recessed at equal intervals on the inner end surface of the ball seat, and has different slopes. The closer the spiral surface is to the top, the gentler the slope; The outer diameter of the front section of the push rod is reduced to form a shoulder, and the peripheral surface of the shoulder is recessed with several concave holes for the balls to be fixed, and the push rod and the ball seat jointly clamp the balls. 2. The mechanical disc brake device according to claim 1, characterized in that: The spiral surface of the ball seat is spirally inclined, and it further includes a first stepped surface and a second stepped surface, the first stepped surface is between the second stepped surface and the groove, and the first stepped surface The slope of the step surface is greater than the slope of the second step surface.

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