CN1008165B - Bicycle brake system - Google Patents

Abstract

A bicycle brake system with front and rear brakes is operated by a pair of hand brake handles through brake pull rods. The brake pull rods are divided into first and third brake pull rods near the hand brake handle and second and fourth brake pull rods near the front and rear brakes. The pull rods are all connected to a plate that rotates around a pivot, and the rotating plate can rotate in a vertical direction around its rotation center line. The installation positions of the first and third brake pull rods on the rotating plate are equidistant from the rotation center line. The fourth brake pull rod is connected to the rear brake, and the second brake pull rod is connected to the front brake. The former is farther from the rotation center line than the latter.

Description

The invention relates to a bicycle brake system. Wherein, a pair of brake pull rods that can be vertically moved are arranged along the vertical pipe of the handlebar, and the pair of brake pull rods are connected with a brake control device having a pair of hand brake handles, and the hand brake handles are respectively located on both sides of the handlebar. The front brake is connected with a brake rod, and the rear brake is connected with another brake rod through a transmission mechanism.

In a traditional bicycle brake system, there is usually a hand brake handle on the right side of the handlebar, which is connected to the front brake through a brake rod, and the hand brake handle on the left side of the handlebar is connected to the front brake through another brake lever. After the moving pull rod is connected with the transmission mechanism, the brake is applied.

With this brake system, when braking suddenly during operation, the force generated by the cyclist clenching the hand brake handle with the habitually used hand, such as the right hand, will be greater than the force on the other hand brake handle. The braking force is on the front wheel, causing the handlebars to lose control and often result in a rollover. Especially in some cases, the cyclist can only brake with one hand, and like this, only operating the front brake has the danger of causing the vehicle to roll over, while only operating the rear brake may result in insufficient braking efficiency.

In addition, in U.S. Patent No. 4,057, in No. 127, a kind of bicycle braking system is disclosed, which includes front and rear brakes, a pair of hand brake handles for manipulating braking and connecting the pair of brake handles with the front and rear brake handles respectively. The transmission mechanism of the rear brake; the transmission mechanism includes a pivotable plate fixed to the handlebar riser, which is respectively connected to the second and fourth brake transmission members of the rotating plate and the front and rear brakes, and the rotating plate The first and third brake transmission parts connected, the distance from the part connected to the first and third brake transmission parts on the above-mentioned rotating plate to the pivot is equal, and the part connected to the second brake transmission part on the rotating plate The distance from the part to the pivot is smaller than the distance from the part on the plate connected to the fourth brake transmission part to the pivot. The structure of this bicycle brake system makes it necessary to manipulate two handbrake handles respectively when braking, and if steel cables are used as the brake transmission parts, a large operating force will be applied, which will produce the aforementioned shortcomings.

The present invention is proposed in view of the above situation, and its purpose is to provide a bicycle brake system, as long as any one of the hand brake handles is manipulated with a small operating force, both the front and rear wheels can be braked, and the braking force of the rear wheels is total. larger than the front wheels.

According to the purpose of the present invention, a brake rod is divided into a first brake rod connected with a hand brake handle and a second brake rod connected with the front brake; A third brake pull rod connected with a hand brake handle and a fourth brake pull rod connected with the rear brake through a transmission mechanism. A pivotal plate is mounted on the handlebar riser and is rotatable about its centerline of rotation approximately vertically, to which the first and third brake levers are coupled, and their mounting positions on the plate Equidistant from the centerline of rotation; the installation position of the second brake lever is closer to the centerline of rotation than that of the fourth brake lever. In addition, the rotating plate extends rearwardly from its rotating pivot and partly extends to the side of the handlebar riser near a certain hand brake lever, and the first, third and fourth brake pull rods are connected to the above-mentioned side of the rotating plate superior.

When manipulating one or two hand brake handles, the pivot plate just turns upwards, thereby driving the two brakes to work. In addition, because the installation position of the second brake pull rod on the plate is closer to the rotation center line than the installation position of the fourth brake pull rod, the displacement of the fourth brake pull rod is larger than that of the second brake pull rod. Thus, the generated rear wheel braking force is greater than the front wheel braking force. This effectively prevents the bicycle from braking A rollover accident occurred.

In order to obtain a structure suitable for the present invention, the brake pull rod of the existing bicycle brake system can also be cut into two sections, and the cut end of each section is directly connected with the rotating plate fixed on the handlebar standpipe, In this way, the existing braking system can be easily modified to the braking system proposed by the present invention.

The purpose, performance and advantages of the present invention mentioned above or not mentioned can be clearly seen from the detailed description of the following embodiments and the accompanying drawings.

Description of drawings:

Accompanying drawing has represented a specific embodiment of the present invention, wherein:

Fig. 1 is a perspective view of a bicycle.

Fig. 2 is an enlarged sectional view taken along line II-II in Fig. 1 .

Fig. 3 is a view taken along the direction of arrow III in Fig. 2 .

Fig. 4 is a perspective view showing part IV detached from Fig. 3 .

Fig. 5 is an enlarged sectional view taken along line V-V in Fig. 2 .

Fig. 6 is a sectional view taken along line VI-VI in Fig. 5 .

Description of the preferred embodiment:

An embodiment of the present invention will now be described in conjunction with the accompanying drawings. See Fig. 1, Fig. 2 at first, handlebar standpipe 2 is installed on the front standpipe 1 of bicycle frame F, and can rotate relative thereto. The first hand brake lever _L1 is positioned at the right side of the handlebar 3, and the handlebar 3 is installed on the upper end of the handlebar riser 2. The first hand lever L ₁ can be rotated to approach or leave the grip 4 . The second hand lever L ₂ is located on the left side of the handlebar 3 and can also be rotated to approach or leave the grip 5 .

The front fork 6 integrally formed with the handlebar stem 2 is mounted with a front brake Bf which is braked by frictional force between itself and the rim 7 of the front wheel Wf. A rear brake Br is installed at the rear of the vehicle frame F, which is tightly surrounded by the brake disc 8, and the brake disc 8 rotates with the rear wheel Wr to generate a braking force.

See Fig. 3, Fig. 4 again, the first and second handbrake lever _L1 and _L2 are fixed as a whole with the outer end of a pair of rotating shafts 11 and 12 respectively, and rotating shafts 11 and 12 are respectively fixed on the handlebar 3 by two The brackets 9 and 10 are supported and rotatable, and the brackets 9 and 10 are located on both sides of the handlebar 3 respectively. Rods 13, 14 are connected to opposite inner ends of the rotating shafts 11 and 12 respectively, and are bent into a shape extending parallel to each other to one side of the handlebar stem 2. Torsion springs 15 and 16 surround the corresponding rotating shafts 11 and 12 respectively, and their one ends are respectively connected with corresponding rods 13 and 14, and the other ends are connected with handlebar 3, so that rods 13, 14 and rotating shafts 11 and 12 are directed toward the user. The hand brake handles L ₁ and L ₂ are turned in the direction away from the grips 4 and 5 .

The upper end of the first brake pull rod 17 vertically arranged along the handlebar standpipe 2 is connected with the rod 13, and the rod 13 is connected with the rotating shaft 11, and the rotating shaft 11 is integrated with the first hand brake handle _L1 . The third brake pull rod 19 parallel to the first brake pull rod 17 has another rod 14 connected to its upper end, and the rod 14 is connected to the rotating shaft 12 integrated with the hand brake handle L ₂ .

In the front brake Bf, a pair of brake pads 22 are fixed on the lower ends of the two sides of the brake fork 21. The shape of the brake fork 21 is approximately U-shaped, so it can be installed on both sides of the front wheel Wf, and the brake pads 22 can be tightened. Attached to rim 7. A brake guide rod 23 protruding downward from the lower end of the brake fork 21 is inserted into a bracket 24 fixed to the front fork 6 and is movable. In this way, the brake fork 21 is mounted on the front fork 6 and can move in a direction in which the brake shoe 22 approaches or separates from the rim 7 .

The lower end of the second brake rod 18 vertically arranged along the handlebar standpipe 2 is connected to the upper end of the brake fork 21 of the front brake Bf, whereby the manipulation of the front brake depends on the vertical direction of the second brake rod 18. exercise.

The rear brake Br is a band brake, and its structure is: installed in the brake housing 26 on the vehicle frame F, there is a friction band 28 for holding the outer edge of the brake disc 8, and the brake disc 8 and the rear wheel Wr The wheel shaft 27 is integral, that is, the friction belt 28 is hugged on the outer edge of the brake disc 8 , one end is fixed on the inner surface of the brake housing 26 , and the other end is fixed on the brake rocker arm 29 . The shape of the brake rocker arm 29 is approximately V-shaped, and it can rotate in the brake housing 26. The brake rocker arm 29 is to hinge its corner in the brake housing 26 with a bearing pin 30, and one end of it is connected with an end of the friction band. The other end protrudes downward from the bottom of the brake housing 26, so that the brake operating force is transmitted from the brake housing 26 to the rear brake.

The end of the brake rocker arm 29 protruding from the brake housing 26 is coupled with the transmission mechanism 31 .

The transmission mechanism 31 includes a first transmission lever 33, which is supported on the front of the frame F by a horizontally assembled pin shaft 32, and can rotate relative thereto; a second transmission lever 35, which is supported by a horizontally assembled pin shaft 34 It is in the middle of the frame F and can rotate relative to it. In addition, there is a first transmission link 36 for connecting the first and second transmission levers 33, 35, and a second transmission link 37 for connecting the second transmission lever 35 and the rear brake Br.

The shape of the first transmission lever 33 is approximately V-shaped, and its corner part is fixed on the vehicle frame F with a pin shaft 32. One end of the first transmission lever 33 is connected with the fourth brake rod 20 vertically arranged along the handlebar standpipe 2. the lower connection.

The shape of the second transmission lever 35 is approximately Y-shaped, one end of which is connected to one end of the first transmission link 36, and the other end is connected with the braking rocker arm 29 of the rear brake Br by the second transmission link 37, and the connection between the two The distance is adjustable.

With this transmission mechanism 31, when the second transmission link 37 moves with the upward movement of the fourth brake rod 20, the rear brake Br is correspondingly operated.

The torsion spring 38 is installed between the second transmission lever 35 and the frame F, so that the second transmission lever 35 or the transmission mechanism 31 is in a position where the rear brake Br is disengaged from the braking state.

In Fig. 5 and Fig. 6, a square bracket 39 is fixed on the handlebar standpipe 2 by means of a mounting part 40, and the bracket 39 is positioned in front of the handlebar standpipe 2, and the pivot plate 41 is installed on the bracket 39, And can rotate relative to it.

One end of the pivot plate 41 is mounted on the front of the frame 39 and this end has a pair of support arms 42 for assembly with the frame 39 . The support arm 42 is mounted on a horizontal support shaft 43 and can rotate around it.

The other end of the pile pivot plate 41 extends to one side of the handlebar stem 2, and is coupled with the first and third brake rods 17 and 19 at this side. The installation positions of the brake pull rods 17 and 19 on the plate 41 are all l 1 apart from the center line of rotation, that is, the distance of the axis of the support shaft 43 is l ₁ , that is to say, the connecting holes 44 and 45 are located side by side on one end of the plate 41, and are aligned with the rotation axis. The distance between the center lines is _l1 , the first and third brake rods 17 and 19 are inserted into the holes 44 and 45 from above, and the lower ends of the first and third brake rods 17 and 19 are installed on the plate with nuts 46 and 47. 41 on the lower surface.

The distance between the connecting hole 48 on the rotating plate 41 and the center line of rotation is l ₂ , while the distance between the connecting hole 49 and the center line of rotation is l ₃ , and l ₃ is greater than l ₂ , here, the distances l ₂ and l ₃ are smaller than the previous The mentioned distance l ₁ . The second brake pull rod 18 passes through the coupling hole 48 from below, and its upper end is installed on the upper surface of the rotating plate 41 with a nut 50 . The fourth brake rod 20 passes through the coupling hole 49 from below, and its upper end is installed on the upper surface of the rotating plate 41 with a nut 51 .

As shown in FIG. 6 , the spring 52 is installed between the second brake rod 18 and the bracket 39 , and pulls the second brake rod 18 downward, so that the front brake is out of the braking state.

The working process of the embodiment is described as follows.

When the bicycle needs to be braked during operation, the first or second hand brake lever L ₁ or L ₂ is manipulated, or both are operated at the same time, then the first brake lever 17 or the third brake lever 19 moves upward, or both The levers move upwards at the same time, causing the pivot plate 41 to rotate upwards, whereby the second and fourth brake levers 18 and 20 move upwards, activating the front brake Bf and the rear brake Br.

Here the installation position of the fourth brake rod 20 around the pivot plate 41 is farther from the center line of rotation than the installation position of the second brake rod 18, so its upward movement is also larger than the latter. Therefore, the rear brake Br will start to work before the front brake Bf, and the rear braking force is relatively large, that is, the rear wheels can obtain enough braking force, and the excessive braking force of the front wheels can be avoided, thereby reducing the possibility of rollover sex.

In addition, the installation positions of the first and third brake rods 17 and 19 on the rotating plate 41 are farther from the center line of rotation than the installation positions of the second and fourth brake rods 18 and 20, so even if they are rotated around the pivot A relatively small operating force of the shaft turning plate 41 can also produce a relatively large braking force.

Claims (3)

1, a kind of brake system for bicycles comprises front brake, rear brake, rim brake handle that a pair of brake activation is used and the transmission device that connects this adversary's sneek and front and back drg respectively; This transmission device comprise one be fixed in stem can be around a pivotally supported plate, the second and the 4th braking Transmission that connects this rotor plate and forward and backward drg respectively, with this above-mentioned rotor plate and a pair of rim brake handle difference bonded assembly first and the 3rd braking Transmission, equate with the distance of the first, the 3rd braking Transmission bonded assembly position on the above-mentioned rotor plate, be L to above-mentioned pivot ₁, brake the distance L of Transmission bonded assembly position with second on this rotor plate to this pivot ₂Less than braking the distance L of Transmission bonded assembly position with the 4th on this plate to this pivot ₃, i.e. L ₃＞L ₂It is characterized in that, described pivot (43) is positioned at the front end of rotor plate (41), this rotor plate extends back from this pivot, and also some extends to a side of the close a certain rim brake handle of handlebar stem (2), and first, the third and fourth braking Transmission is connected to the above-mentioned part of the rotor plate that extends to handlebar stem (2) one sides.

2, according to the brake system for bicycles of claim 1, it is characterized in that, the above-mentioned plate (41) that pivots is to be installed in handlebar stem (2 by support 39,1) on, support 39 is contained in above-mentioned handlebar stem (2,1) on, spring (52) is contained between the second and the 4th lever connection one of them and the support (39) so that towards brake operation force opposite directive effect lever connection (18) and rotor plate 41.

According to the brake system for bicycles of claim 2, it is characterized in that 3, the above-mentioned plate (41) that pivots has a pair of support arm (42,42), this front end to support arm autorotation plate 14 extends downwards and is contained in rotationally on the axle (43).

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