Improved brake master cylinder for linkage brake system

Abstract

The utility model relates to an improved brake master cylinder for a linkage brake system. The brake master cylinder comprises a cylinder body, a plunger, a first rebound spring, a first lever, a carriage and a second rebound spring. The cylinder body is arranged on a frame, and the plunger and the first rebound spring are contained in the cylinder body. The first lever is pivoted to the cylinder body and can be pushed by the second brake handle, so that the brake master cylinder sends out hydraulic oil. The carriage is provided with a long hole, and the first lever is pivoted in the long hole and can be linked by the first brake operating device, so that the brake master cylinder sends out hydraulic oil. And the second rebound spring is arranged between the cylinder body and the carriage. When the carriage is pulled, the second springback spring can be compressed, so that the spring coil adherence phenomenon of the second springback spring occurs, and the maximum actuating stroke of the carriage is limited. Therefore, by means of the adherence phenomenon of the spring coil, the mode that in the prior art, an interference piece needs to be additionally arranged to limit the maximum actuation stroke of the first lever can be replaced, the number of parts is effectively reduced, and the machining cost and working hours of the interference piece can be saved.

Description

Technical Field

[0001] The utility model relates to a master brake cylinder for a linked braking system, especially an improved master brake cylinder for a linked braking system applicable to a motorcycle. Background Art

[0002] To improve the riding safety of motorcycles, the government has enforced relevant vehicle safety laws to compulsorily install a linked braking system to effectively shorten the braking distance.

[0003] Please refer to Figures 1 to 3 , which are respectively the configuration diagram, partial cross-sectional view and actuation diagram of the existing linked braking system. The figure shows an existing master brake cylinder for a linked braking system disclosed in Taiwan Patent No. M548123. This design type is to overcome the situation that in case of a breakage in the brake oil pipe of the linked braking, it can still ensure that another braking mechanism can function normally, effectively avoiding a complete failure of the braking system. The said linked braking system mainly includes a first braking operation device 1, a second braking operation device 2, a first braking generation device 3, a second braking generation device 4, a first braking wire 5, a linkage wire 6 and a first brake oil pipe 7.

[0004] Among them, the first braking operation device 1 includes a first brake handle 12 and a force distribution unit 11. The first brake handle 12 is pivotally arranged on the vehicle frame 9 and can be operated by a rider to receive a force for braking. The first brake handle 12 transmits the received force to the force distribution unit 11. There is a balance member 111 inside the force distribution unit 11. The balance member 111 is connected to the second braking operation device 2 by the linkage wire 6, and the balance member 111 is connected to the first braking generation device 3 by the first braking wire 5. The balance member 111 can distribute the force from the first brake handle 12 to the linkage wire 6 and the first braking wire 5, and then transmit them to the second braking operation device 2 and the braking generation device 3 respectively.

[0005] The second braking operation device 2 includes a master brake cylinder 20 and a second brake handle 25. The master brake cylinder 20 includes a cylinder block 21, a plunger 22, a first lever 23, a second lever 24, a first return spring 27, a second return spring 28, and an interference member 29. Among them, the first lever 23, the second lever 24, and the second brake handle 25 are all pivotally connected to the cylinder block 21. The second lever 24 can be pushed by the first lever 23 or the second brake handle 25. The second lever 24 can push the plunger 22 and the first return spring 27, so that the second braking operation device 2 sends out a hydraulic oil. The first lever 23 can be pulled by the force transmitted by the linkage wire 6, and a second return spring 28 and an interference member 29 are provided between the first lever 23 and the cylinder block 21. The second brake spring 28 can reset the first lever 23 when the first lever 23 is no longer subjected to the force of the linkage wire 6 after actuation. The interference member 29 can limit the maximum actuation stroke of the first lever 23. When an abnormality occurs in the second braking generation device 4, the interference member 29 can provide a reaction force so that the balance member 111 can continuously provide a force to the first brake wire 5.

[0006] The first braking generation device 3 is an existing drum brake system, which can generate a braking force by receiving the force from the first brake wire 5. The second braking generation device 4 is a combination of an existing disc brake caliper 41 and a brake disc 42. The second braking generation device 4 can transmit the oil pressure generated by the second braking operation device 2 to the second braking generation device 4 through the first brake oil pipe 7. When the second braking generation device 4 receives an oil pressure signal, the brake caliper 41 will clamp the brake disc 42 to generate a braking force.

[0007] However, as Figure 3 shown, the interference member 29 in the second braking operation device 2 is used to limit the actuation stroke of the first lever 23 to ensure that when an abnormal brake oil leakage occurs in the second braking generation device 4, the entire braking system is prevented from failing. Among them, the interference member 29 is installed on one side of the second return spring 28. Therefore, the interference member 29 presents a T-shaped shape and can be sleeved in the second return spring 28. However, the T-shaped shape is time-consuming to process and affects the cost increase. Therefore, it is necessary to seek improvement.

[0008] Due to this, the inventor, in the spirit of active invention, urgently thought about an improved master brake cylinder for a linkage braking system that can solve the above problems. After several research and experiments, the present utility model was finally completed. Summary of the Invention

[0009] The main object of the present utility model is to provide an improved master brake cylinder for a linkage braking system. By using the spring coil adhesion phenomenon of the second return spring, it can replace the existing method of additionally setting an interference member to limit the maximum actuation stroke of the first lever, effectively reducing the number of parts and saving the processing cost and working hours of the interference member.

[0010] To achieve the above object, the present utility model provides an improved master brake cylinder for a linked braking system. The linked braking system includes a first brake operating device, a second brake operating device, a first brake generating device, and a second brake generating device. The first brake operating device is respectively connected to the second brake operating device and the first brake generating device. The second brake operating device is connected to the second brake generating device. The second brake operating device includes a master brake cylinder and a second brake handle pivotally connected to the master brake cylinder. The master brake cylinder includes a cylinder block, a plunger, a first return spring, a first lever, a drag plate, and a second return spring. The cylinder block is disposed on a vehicle frame. The plunger is received in the cylinder block. The first return spring is received in the cylinder block. The first lever is pivotally connected to the cylinder block and can be pushed by the second brake handle, thereby pushing the plunger and the first return spring to cause the master brake cylinder to send out hydraulic oil. The drag plate has a long hole. The first lever is pivotally connected in the long hole and can be linked by the first brake operating device. The first lever further pushes the plunger and the first return spring to cause the master brake cylinder to send out hydraulic oil. The second return spring is disposed between the cylinder block and the drag plate. When the second return spring is pulled by the drag plate, it can be compressed, causing the spring coils of the second return spring to adhere to each other, thereby restricting the maximum actuation stroke of the drag plate.

[0011] The maximum displacement of the first lever pulled by the drag plate can be less than the maximum displacement of the first lever pushed by the second brake handle. Due to the spring coil adhesion phenomenon of the second return spring, the maximum displacement of the first lever pulled by the drag plate will be restricted. When the second brake handle pushes the first lever, the first lever can move relative to the drag plate, so it is not restricted by the maximum displacement of the drag plate pulled.

[0012] When the spring coil adhesion phenomenon occurs in the second return spring, the length of the spring coil adhesion of the second return spring is the total number of turns of the second return spring plus one multiplied by the wire diameter of the spring wire of the second return spring. Thus, since the maximum actuation stroke of the drag plate is the distance between the drag plate and the cylinder block minus the length of the spring coil adhesion of the second return spring, the maximum actuation stroke of the drag plate can be calculated by calculating the length of the spring coil adhesion.

[0013] The first embodiment of the above-mentioned first brake operating device may include a first brake handle and a force distribution unit. The first brake handle is pivotally provided on the vehicle frame and can transmit the operating force of the rider to the force distribution unit. There is a balance member in the force distribution unit. The balance member is connected to the drag plate by a linkage wire, and the balance member is connected to the first brake generating device by a first brake wire.

[0014] The second embodiment of the above-described first brake operating device may include a first master brake cylinder and a first brake handle. The first brake handle is connected to the carriage by a linkage wire. The first master brake cylinder includes a first cylinder block, a first plunger, a spring, and a lever. The first cylinder block is disposed on the vehicle frame. The first plunger is received in the first cylinder block. The spring is received in the first cylinder block. The first brake handle is pivotally connected to the lever. The lever is pivotally connected to the first cylinder block and can be pushed by the first brake handle, thereby pushing the first plunger and the spring, causing the first master brake cylinder to send hydraulic oil to the first brake generating device.

[0015] The third embodiment of the above-described first brake operating device may include a first brake handle and a balance member. The first brake handle is pivotally provided on the balance member and is connected to the first brake generating device by a first brake wire. The balance member is pivotally provided on the vehicle frame and is connected to the carriage by a linkage wire.

[0016] In the first embodiment and the third embodiment of the above-described first brake operating device, the first brake generating device may be a drum brake generating device.

[0017] In the second embodiment of the above-described first brake operating device, the first brake generating device may be a disc brake generating device.

[0018] The above summary and the following detailed description are exemplary and are intended to further illustrate the scope of the patent application of the present invention. Other objects and advantages of the present invention will be described in the subsequent specific embodiments and drawings. Brief Description of the Drawings

[0019] Figure 1 It is a configuration diagram of an existing linkage brake system.

[0020] Figure 2 It is a partial cross-sectional view of an existing linkage brake system.

[0021] Figure 3 It is an operation diagram of an existing linkage brake system.

[0022] Figure 4 It is a configuration diagram of the linkage brake system according to the first embodiment of the present invention.

[0023] Figure 5 It is an operation diagram of the linkage brake system according to the first embodiment of the present invention.

[0024] Figure 6 It is a configuration diagram of the linkage brake system according to the second embodiment of the present invention.

[0025] Figure 7 It is a partial cross-sectional view of the linkage brake system according to the second embodiment of the present invention.

[0026] Figure 8Actuation diagram of the interlocking brake system according to the second embodiment of the present utility model.

[0027] Figure 9 Configuration diagram of the interlocking brake system according to the third embodiment of the present utility model.

[0028] Figure 10 Partial cross-sectional view of the interlocking brake system according to the third embodiment of the present utility model.

[0029] Figure 11 Actuation diagram of the interlocking brake system according to the third embodiment of the present utility model.

[0030] Description of main component symbols:

[0031] 1, 1b, 1c First brake operation device

[0032] 10b First master brake cylinder

[0033] 11 Force distribution unit

[0034] 111 Balancing member

[0035] 112 Lever

[0036] 12 First brake handle

[0037] 13 First cylinder block

[0038] 14 First plunger

[0039] 15 Spring

[0040] 2, 2a, 2b, 2c Second brake operation device

[0041] 20, 20a, 20b, 20c Brake master cylinder

[0042] 21 Cylinder block

[0043] 22 Plunger

[0044] 23 First lever

[0045] 24 Second lever

[0046] 25 Second brake handle

[0047] 26 Slide plate

[0048] 261 Long hole

[0049] 27 First return spring

[0050] 28, 28a, 28b, 28c Second return spring

[0051] 29 Interference member

[0052] 3,3b First brake generating device

[0053] 37 Brake caliper

[0054] 4 Second brake generating device

[0055] 41 Disc brake caliper

[0056] 42 Brake disc

[0057] 5 First brake wire

[0058] 6 Linkage wire

[0059] 7 First brake oil pipe

[0060] 8 Second brake oil pipe

[0061] 9 Frame

[0062] a, b, c Linkage brake system Detailed implementation manner

[0063] Please refer to Figure 4 and Figure 5 , which are respectively the configuration diagram and the operation diagram of the linkage brake system of the first embodiment of the present utility model. The figure shows an improved brake master cylinder for a linkage brake system, which is used to prevent the entire brake system from failing when an abnormal brake oil leakage occurs in the second brake generating device. Among them, the basic structure of the linkage brake system a in this embodiment is the same as that of the prior art, except that in this embodiment, the brake master cylinder 20a of the second brake operating device 2a is improved.

[0064] As Figure 4 and Figure 5 shown, the second brake operating device 2a includes a brake master cylinder 20a and a second brake handle 25. The brake master cylinder 20a includes a cylinder block 21, a plunger 22, a first lever 23, a first return spring 27, a second return spring 28a, and a drag plate 26. Among them, the first lever 23 and the second brake handle 25 are both pivotally connected to the cylinder block 21. The other end of the first lever 23 is pivotally connected to a long hole 261 of the drag plate 26. A plunger 22 and a first return spring 27 are arranged in the cylinder block 21. The first return spring 27 pushes the plunger 22 to one side. The first lever 23 can be pushed by the second brake handle 25, and the first lever 23 can push the plunger 22 and the first return spring 27 to make the second brake operating device 2a send out a hydraulic oil.

[0065] The first lever 23 can be pulled by the force transmitted through the linkage wire 6 via the platen 26, and a second return spring 28a is provided between the platen 26 and the cylinder block 21. The second return spring 28a can reset the platen 26 when the force of the linkage wire 6 is no longer applied after actuation, and the second return spring 28a can be compressed when the platen 26 is pulled by the linkage wire 6. Among them, when the second brake generating device 4 has an abnormal brake fluid leakage phenomenon, the platen 26 will excessively compress the second return spring 28a, causing the spring coils of the second return spring 28a to adhere to each other. At this time, the second return spring 28a can no longer be compressed, which can limit the maximum actuation stroke of the platen 26, enabling the force distribution unit 11 of the first brake operating device 1 to continuously apply force to the first brake wire 5 to avoid brake system failure.

[0066] Please refer to Figures 6 to 8 , which are respectively the configuration diagram, partial cross-sectional view, and actuation diagram of the linkage brake system according to the second embodiment of the present invention. The figure shows an improved master brake cylinder for a linkage brake system, which is used to prevent the entire brake system from failing when the second brake generating device has an abnormal brake fluid leakage phenomenon. Among them, the master brake cylinder 20b of the second brake operating device 2b in this embodiment uses the second return spring 28b to cause the spring coils to adhere to each other, similar to the first embodiment, to limit the maximum actuation stroke of the platen 26. The difference between this embodiment and the first embodiment is that: in the linkage brake system b of this embodiment, the first brake operating device 1b and the first brake generating device 3b use a master brake cylinder and a disc brake generating device to actuate the brake, and the connection methods of the first brake operating device 1b with the second brake operating device 2b and the first brake generating device 3b are also slightly different from those of the first embodiment.

[0067] In this embodiment, the first brake operating device 1b includes a first master brake cylinder 10b and a first brake handle 12. The first master brake cylinder 10b includes a first cylinder block 13, a first plunger 14, a spring 15, and a lever 112. The first cylinder block 13 is disposed on the vehicle frame 9, the first brake handle 12 is pivotally connected to the lever 112, the lever 112 is pivotally connected to the first cylinder block 13, and the first plunger 14 and the spring 15 are accommodated in the first cylinder block 13. Among them, the lever 112 can be pushed by the first brake handle 12, thereby pushing the first plunger 14 and the spring 15, causing the first master brake cylinder 10b to send hydraulic oil through a second brake oil pipe 8 to the first brake generating device 3b. The first brake generating device 3b includes a brake caliper 37. When the brake caliper 37 is input with an oil pressure, the brake caliper 37 will clamp a brake disc (not shown in the figure), and the first brake generating device 3b will generate a braking force. In addition, the first brake handle 12 is connected to the platen 26 by a linkage wire 6 to transmit the force from the first brake handle 12 to the second brake operating device 2b.

[0068] Please refer to Figures 9 to 11 , which are respectively the configuration diagram, partial cross-sectional view and actuation diagram of the linkage braking system according to the third embodiment of the present invention. A modified master cylinder for a linkage braking system is shown in the figure, which is used to prevent the entire braking system from failing when an abnormal brake fluid leakage occurs in the second braking generating device. Among them, the master cylinder 20c of the second braking operating device 2c in this embodiment, like that in the first embodiment, uses the second return spring 28c to cause the spring coils to adhere to each other, so as to limit the maximum actuation stroke of the slide plate 26. The difference between this embodiment and the first embodiment lies in that the connection methods of the first braking operating device 1c of the linkage braking system c in this embodiment to the second braking operating device 2c and the first braking generating device 3 are different from those in the first embodiment.

[0069] In this embodiment, the first braking operating device 1c includes a first braking handle 12 and a balance member 111. The first braking handle 12 is pivotally mounted on the balance member 111 and is operable by a rider to apply a force for braking. A first braking wire 5 is connected to the first braking generating device 3. The balance member 111 is pivotally mounted on the frame 9 and is connected to the slide plate 26 by a linkage wire 6. The first braking handle 12 directly transmits the received force to the first braking generating device 3 through the first braking wire 5, or pushes the balance member 111 to actuate and transmits the force to the second braking operating device 2c through the linkage wire 6.

[0070] However, looking at the above three designs of the linkage braking system, the adhesion length design of the second return springs 28a, 28b, 28c is the total number of turns plus one multiplied by the wire diameter of the spring wire. Therefore, the maximum actuation stroke of the slide plate 26 is the distance between the slide plate 26 and the cylinder block 21 minus the adhesion length of the spring coils of the second return springs 28a, 28b, 28c. When a brake fluid leakage problem occurs in the braking system, during the actuation of the first braking handle 12 of the first braking operating devices 1, 1b, 1c, the second return springs 28a, 28b, 28c of the second braking operating devices 2a, 2b, 2c will have the spring coils adhere to each other, so that the first braking generating devices 3, 3b can still generate braking. Therefore, the maximum displacement of the first lever 23 pulled by the slide plate 26 will be less than the maximum displacement of the first lever 23 pushed by the second braking handle 25.

[0071] The above embodiments are only examples for convenience of explanation. The scope of the rights claimed by the present invention shall be subject to the scope claimed in the patent application documents, rather than being limited to the above embodiments.

Claims

1. An improved brake master cylinder for a linked brake system, characterized in that: The linked brake system includes a first brake operating device, a second brake operating device, a first brake generating device and a second brake generating device, wherein the first brake operating device is connected to the second brake operating device and the first brake generating device respectively, and the second brake operating device is connected to the second brake generating device. The second brake operating device includes a brake master cylinder and a second brake handle pivotally connected to the brake master cylinder, and the brake master cylinder includes: A cylinder body is arranged on a frame; A plunger is accommodated in the cylinder; a first rebound spring, accommodated in the cylinder; a first lever, pivotally connected to the cylinder body, and capable of being pushed by the second brake handle, thereby pushing the plunger and the first rebound spring, so that the brake master cylinder delivers hydraulic oil; A drag plate having a long hole, the first lever being pivotally connected to the long hole and being linked to the first brake operating device, the first lever further pushing the plunger and the first rebound spring to enable the brake master cylinder to deliver hydraulic oil; as well as A second rebound spring is disposed between the cylinder body and the carriage; When the drag plate is pulled, the second rebound spring can be compressed, so that the spring coil of the second rebound spring is tightly attached, thereby limiting the maximum actuation stroke of the drag plate.

2. The improved brake master cylinder for a linked brake system as claimed in claim 1, characterized in that: The maximum displacement of the first lever pulled by the drag plate is smaller than the maximum displacement of the first lever pushed by the second brake handle.

3. The improved master brake cylinder for a linked brake system as claimed in claim 1, characterized in that: When the spring coil of the second rebound spring is tightly attached, the spring coil tightly attached length of the second rebound spring is the total number of turns of the second rebound spring plus one multiplied by the spring wire diameter of the second rebound spring.

4. The improved master brake cylinder for a linked brake system as claimed in claim 1, characterized in that: The first brake operating device includes a first brake handle and a force distribution unit. The first brake handle is pivotally mounted on the frame and can transmit the operating force of the rider to the force distribution unit. The force distribution unit has a balance member inside. The balance member is connected to the drag plate by a linkage wire, and the balance member is connected to the first brake generating device by a first brake wire.

5. The improved master brake cylinder for a linked brake system as claimed in claim 1, characterized in that: The first brake operating device includes a first brake master cylinder and a first brake handle, the first brake handle is connected to the trailer by a linkage wire, the first brake master cylinder includes a first cylinder body, a first plunger, a spring and a lever, the first cylinder body is arranged on the frame, the first plunger is accommodated in the first cylinder body, the spring is accommodated in the first cylinder body, the first brake handle is pivotally connected to the lever, the lever is pivotally connected to the first cylinder body, and can be pushed by the first brake handle, thereby pushing the first plunger and the spring, so that the first brake master cylinder delivers hydraulic oil to the first brake generating device.

6. The improved brake master cylinder for a linked brake system as claimed in claim 1, characterized in that: The first brake operating device includes a first brake handle and a balance member. The first brake handle is pivoted on the balance member and connected to the first brake generating device through a first brake wire. The balance member is pivoted on the frame and connected to the drag plate through a linkage wire.

7. The improved master brake cylinder for a linked brake system according to claim 4 or claim 6, characterized in that: The first brake generating device is a drum brake generating device.

8. The improved brake master cylinder for a linked brake system as claimed in claim 5, characterized in that: The first brake generating device is a disc brake generating device.

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