CN213442504U

CN213442504U - Brake master cylinder for linkage brake system

Info

Publication number: CN213442504U
Application number: CN202022447290.8U
Authority: CN
Inventors: 郭荣彬; 庄泽铭
Original assignee: Sanyang Industry Co Ltd
Current assignee: Sanyang Industry Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-06-15
Anticipated expiration: 2030-10-29

Abstract

The utility model relates to a brake master cylinder for a linked brake system. The linked brake system mainly includes a first brake master cylinder and a second brake master cylinder. The first brake master cylinder includes a first brake master cylinder. A cylinder block, a first brake lever, an actuating rod and a brake wire, the first cylinder block has a first oil chamber, a first plunger and a first spring, the first brake lever is pivotally connected to the first cylinder block There is a rotating shaft, the actuating rod is pivotally connected to the first cylinder body, and the brake wire includes a first sleeve, a second sleeve and an inner wire that passes through the first sleeve and the second sleeve, Wherein, the inner wire section between the first sleeve and the second sleeve surrounds the rotating shaft. Therefore, in addition to maintaining the original interlocking braking performance, the utility model can make the brake wire have better durability, and can also take into account the pressing feel when the rider operates the brake, so as to improve the service life of the interlocking brake system and operability.

Description

Brake master cylinder for linkage brake system

Technical Field

The present invention relates to a master cylinder for a linkage brake system, and more particularly to a master cylinder for a linkage brake system of a motorcycle.

Background

In order to improve the riding safety of the motorcycle, a linkage brake system must be developed to effectively shorten the braking distance, and particularly, a disc brake system configured by a front brake system and a rear brake system must maintain good mechanism maneuverability in designing the linkage brake, so that the linkage brake actuation can be normal, and meanwhile, the control cost can be considered. Referring to fig. 17, a schematic cross-sectional view of a conventional coupled brake system is shown, for example, the coupled brake system disclosed in taiwan patent No. TW I653169. As shown in the figure, the conventional linkage brake system mainly includes a first master brake pump 91, a second master brake pump 92, a first caliper 93, a second caliper 94, a brake wire 98, a first brake oil pipe 96 and a second brake oil pipe 97, wherein the first master brake pump 91 includes a first cylinder 911, a first brake lever 912 and an actuating rod 915.

The actuating rod 915 is disposed on the first pivot point 9111 of the first cylinder 911, and the actuating rod 915 is actuated to push a first plunger 913, so that the first cylinder 911 sends a hydraulic pressure to the first brake caliper 93. The first brake lever 912 is mounted on the second pivot point 9112 of the first cylinder 911, the rocker arm 925 is mounted on the third pivot point 9221 of the second cylinder 921, the rocker arm 925 moves to move a second plunger 923, so the second cylinder 921 sends a hydraulic pressure to the second brake caliper 94, the brake wire 98 includes a first sleeve 981 and an inner wire 982 passing through the first sleeve 981, the inner wire 982 transmits the force applied by the first brake lever 912 to the rocker arm 925, one end of the first sleeve 981 abuts against the actuating rod 915, and the other end abuts against the second cylinder 921.

When the brake lever 912 is operated, the inner wire 982 pulls the rocker arm 925 with a force applied by the brake lever 912, and the reaction force of the first sleeve 981 pushes the actuating rod 915, so that the first brake caliper 93 and the second brake caliper 94 are actuated to generate a braking force. The brake wire 98 is disposed between the first master cylinder 91 and the second master cylinder 92, and the path of the brake wire 98 is usually in a bending state, because the brake wire 98 must bear the force exerted by the first brake lever 912, the brake wire 98 must have a certain strength to avoid breaking, and the opposite first sleeve 981 must also have sufficient rigidity to avoid over-compression due to the reaction force of the wire to make the hand feel soft, but the sleeve with sufficient rigidity will apply force to the actuating rod 915 when bending, so that the first plunger 913 is applied force to the actuating rod 915 when the brake lever 912 is not actuated, and the pressure of the first brake caliper 93 cannot be released.

The inventor has earnestly appreciated that, in view of the above, the present invention provides a master cylinder for a linkage brake system, which can solve the above problems, and the present invention has been completed through several research experiments.

SUMMERY OF THE UTILITY MODEL

The main objective of the present invention is to provide a brake master cylinder for linkage brake system, which can make the brake wire have better durability by changing the configuration between the first operating lever, the actuating rod and the brake wire, besides the original linkage brake performance, and can also give consideration to the pressing feeling when the rider operates the brake, so as to improve the service life and operability of the linkage brake system.

In order to achieve the above object, the present invention provides a master cylinder for a linkage brake system, which is a first master cylinder for a linkage brake system, including a first cylinder body, a first brake lever, an actuating rod and a brake wire, wherein the first cylinder body has a first oil chamber, a first plunger and a first spring, the first brake lever is pivoted to the first cylinder body, and a pivot is provided, the actuating rod is pivoted to the first cylinder body, and one end of the actuating rod has a first pushing portion for pushing the first plunger, the brake wire includes a first sleeve, a second sleeve and an inner wire penetrating the first sleeve and the second sleeve, one end of the first sleeve and the second sleeve is respectively fixed on the actuating rod. Wherein, the inner line section between the first sleeve and the second sleeve surrounds the rotating shaft.

Secondly, the utility model discloses a brake master cylinder that confession interlock braking system of another design used is a first brake master cylinder among the interlock braking system, including a first cylinder body, a first brake lever, an actuating rod and a brake wire, first cylinder body has a first grease chamber, a first plunger and a first spring, first brake lever pin joint is on first cylinder body, and be equipped with a pivot, actuating rod pin joint is on first cylinder body, and actuating rod's one end has a first portion of pushing away, be used for supporting and push away first plunger, the brake wire includes a first sleeve pipe and one wears to locate the interior line in first sleeve pipe, first sheathed tube one end sets firmly on actuating rod. One end of the inner wire is fixedly arranged on a fixed point of the actuating rod, and an inner wire section positioned between the first sleeve and the fixed point surrounds the rotating shaft.

Furthermore, the utility model discloses a brake master cylinder that confession interlock braking system of another design used is a first brake master cylinder among the interlock braking system, including a first cylinder body, a first brake lever, an actuating rod and a brake wire, first cylinder body has a first grease chamber, a first plunger and a first spring, first brake lever pin joint is on this first cylinder body, and be equipped with a pivot, actuating rod pin joint is on first cylinder body, and actuating rod's one end has a first portion of pushing away, be used for supporting to push away this first plunger, the brake wire includes a first sleeve pipe and one wears to locate the interior line of first sleeve pipe, first sheathed tube one end sets firmly on first cylinder body. One end of the inner wire is fixedly arranged on a fixed point of the actuating rod, and an inner wire section positioned between the first sleeve and the fixed point surrounds the rotating shaft.

Through the above design, because the utility model discloses when carrying out the power transmission, the pivot pulling interior line utilizes the pulley relation, so the brake wire need not use the higher brake line sleeve pipe specification of rigidity, can reach the effect of interlock brake, and also less relatively to the first sleeve pipe produced the application of force that makes the pole in the crooked production of the route trend of assembly layout, does not influence the normal action that makes the pole, so can not cause the unable release scheduling problem of first brake caliper pressure yet.

In order to establish perfect interlock braking system, the utility model discloses except having above-mentioned first brake master cylinder, more can link first brake master cylinder and a second brake master cylinder, reach the interlock braking system that the two-wheeled all has the dish function of stopping.

The linkage brake system may further include a second master cylinder including a second cylinder body, a second brake lever and a rocker arm, the second cylinder body having a second oil chamber, a second plunger and a second spring for containing hydraulic oil and providing a change in oil pressure at a proper time, the second brake lever and the rocker arm being pivotally connected to the second cylinder body, and the rocker arm having a second pushing portion for pushing the second plunger. Therefore, when the first brake lever is continuously pressurized, the first plunger applies a reaction force to the actuating rod to resist the rotation of the actuating rod, and the rotating shaft of the first brake lever is far away from the actuating rod, so that the rocker arm pushes the second plunger, and the second brake master cylinder generates a hydraulic pressure to drive the second brake caliper to generate linkage brake.

The linkage brake system may further include a first brake caliper and a second brake caliper, the first brake caliper is connected to the first cylinder through a first brake oil pipe, and the second brake caliper is connected to the second cylinder through a second brake oil pipe. Therefore, when the first brake caliper is input with oil pressure, braking force can be generated on the rear wheel brake disc to decelerate or stop the vehicle; when the second brake caliper is input with oil pressure, the brake force can be generated on the front wheel brake disc to decelerate or stop the vehicle.

The foregoing summary, as well as the following detailed description, is exemplary in nature and is intended to further illustrate the claimed invention. Other objects and advantages of the present invention will become apparent from the following description and drawings.

Drawings

Fig. 1 is an architecture diagram of an interlocking brake system according to a first embodiment of the present invention.

Fig. 2 is a side view of a first master cylinder according to a first embodiment of the present invention.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a sectional view showing an initial state of operation of the first master cylinder according to the first embodiment of the present invention.

Fig. 5 is a sectional view showing a first master cylinder linkage braking state according to the first embodiment of the present invention.

Fig. 6 is a cross-sectional view showing a broken state of a brake wire of the first master cylinder according to the first embodiment of the present invention.

Fig. 7 is an initial actuation cross-sectional view showing a broken state of a brake wire of the first master cylinder according to the first embodiment of the present invention.

Fig. 8 is a continuous actuation cross-sectional view showing a broken state of the brake wire of the first master cylinder according to the first embodiment of the present invention.

Fig. 9 is an architecture diagram of an interlocking brake system according to a second embodiment of the present invention.

Fig. 10 is a sectional view of a first master cylinder according to a second embodiment of the present invention.

Fig. 11 is a sectional view showing an initial state of operation of a first master cylinder according to a second embodiment of the present invention.

Fig. 12 is a sectional view showing a first master cylinder linkage braking state according to the second embodiment of the present invention.

Fig. 13 is an architecture view of an interlock brake system according to a third embodiment of the present invention.

Fig. 14 is a sectional view of a first master cylinder according to a third embodiment of the present invention.

Fig. 15 is a sectional view showing an initial state of operation of a first master cylinder according to a third embodiment of the present invention.

Fig. 16 is a sectional view showing a first master cylinder linkage braking state according to a third embodiment of the present invention.

Fig. 17 is a partial sectional view of a conventional interlock brake system.

Description of the main element symbols:

1, 1' first brake master cylinder

11 first cylinder

111 first pivot point

112 second pivot point

113 first lead fixing seat

12 first brake lever

121 push part

122 rotating shaft

123 end part

13 first plunger

14 first oil chamber

15, 15' actuating rod

151 first lead fixing seat

152 first push part

153 second wire fixing seat

154 fixed point

16 first spring

2 second brake master cylinder

21 second cylinder body

22 second brake lever

221 third pivot point

23 second plunger

25 rocking arm

3 first brake caliper

4 second brake caliper

6 first brake oil pipe

7 second brake oil pipe

8 brake wire

81 first sleeve

82 inner line

821 first end part

822 second end portion

83 second sleeve

831 thread end

832 nut

91 first brake master cylinder

911 first cylinder body

9111 first pivot point

9112 second pivot point

912 first brake lever

913 first plunger

915 actuating rod

92 second brake master cylinder

921 second cylinder

9221 third pivot point

923 second plunger

925 rocker arm

93 first brake caliper

94 second brake caliper

96 first brake oil pipe

97 second brake oil pipe

98 brake wire

981 first sleeve

982 internal line

S stroke

Detailed Description

Fig. 1 to fig. 3 are an architecture diagram of an interlocking brake system according to a first embodiment of the present invention, a side view of a first master cylinder, and a sectional view a-a of fig. 2. The drawing shows a linkage brake system, which mainly comprises a first brake master cylinder 1, a second brake master cylinder 2, a first brake caliper 3, a second brake caliper 4, a brake wire 8, a first brake oil pipe 6 and a second brake oil pipe 7. The first master cylinder 1 and the second master cylinder 2 are respectively used for controlling the braking systems of the front wheel and the rear wheel or controlling the braking systems of the front wheel and the rear wheel in a linkage manner.

As shown in fig. 3, the first master cylinder 1 includes a first cylinder 11, a first brake lever 12, an actuating rod 15 and a brake cable 8, the first cylinder 11 has a first oil chamber 14, a first plunger 13 and a first spring 16, the first oil chamber 14 is filled with hydraulic oil, when the first plunger 13 moves, the first spring 16 is compressed, and a part of the hydraulic oil in the first oil chamber 14 is pushed out of the first cylinder 11, so that the first master cylinder 1 generates an oil pressure. The actuating rod 15 and the first cylinder 11 are pivotally connected to the first pivot point 111, and have a first wire fixing seat 151, a second wire fixing seat 153, and a first pushing portion 152 for pushing against the first plunger 13, the first pivot point 111 is located between the first wire fixing seat 151 and the first pushing portion 152, when the actuating rod 15 rotates, the first pushing portion 152 can push the first plunger 13 to move, the first brake lever 12 and the first cylinder 11 are pivotally connected to the second pivot point 112, the first brake lever 12 can be operated by a rider to brake, and the first brake lever 12 has an end 123, a pushing portion 121, and a rotating shaft 122.

As shown in fig. 1, the second master cylinder 2 includes a second cylinder 21, a second brake lever 22 and a rocker arm 25, the second cylinder 21 has a second oil chamber (not shown), a second plunger 23 and a second spring (not shown), when the second plunger 23 moves, the second spring is compressed, and a part of hydraulic oil in the second oil chamber is pushed out of the second cylinder 21, so that the second master cylinder 2 generates an oil pressure. The second brake lever 22 is pivoted to the third pivot point 221 together with the swing arm 25 and the second cylinder 21, so that the second plunger 23 is pushed when the swing arm 25 rotates; and when the second brake lever 22 is rotated, the swing arm 25 is pushed.

The first brake oil pipe 6 can transmit the hydraulic oil of the first brake master cylinder 1 to the first brake caliper 3, so that when the first brake caliper 3 is input with the oil pressure, a braking force can be generated on a rear wheel brake disc (not shown) to decelerate or stop the vehicle. The second brake oil pipe 7 can transmit the hydraulic oil of the second master cylinder 2 to the second brake caliper 4, so that when the oil pressure is input to the second brake caliper 4, a braking force can be generated on a front wheel brake disc (not shown) to decelerate or stop the vehicle.

In this embodiment, the brake wire 8 used in the present invention includes a first sleeve 81, a second sleeve 83 and an inner wire 82 passing through the first sleeve 81 and the second sleeve 83, wherein one end of the first sleeve 81 is disposed in the second cylinder 21, the other end is disposed in the first wire fixing seat 151, one end of the second sleeve 83 is disposed in the second wire fixing seat 153, and the other end is disposed with a thread end 831 screwed with a nut 832, wherein the nut 832 and the thread end 831 are tolerance clearance portions for facilitating adjustment of the brake wire 8 by a rider. The inner wire 82 has a first end 821 and a second end 822 at two ends, the first end 821 can pull the swing arm 25, the second end 822 is mounted on the nut 832, and the section of the inner wire 82 between the first sleeve 81 and the second sleeve 83 must surround the rotating shaft 122.

Fig. 4 is a cross-sectional view of the first master cylinder according to the first embodiment of the present invention in an initial operation state. When the first brake lever 12 is initially operated, the inner wire 82 is pulled by the shaft 122, and the first sleeve 81 and the second sleeve 83 generate a reaction force to push the actuating rod 15, so that the first master cylinder 1 generates an oil pressure to generate a braking force for the first brake caliper 3.

Please refer to fig. 5, which is a cross-sectional view illustrating a linkage braking state of the first master cylinder according to the first embodiment of the present invention. When the first brake lever 12 is continuously pressurized, the first plunger 13 exerts a reaction force on the actuating rod 15 to resist the rotation of the actuating rod 15, and the rotating shaft 122 is far away from the actuating rod 15, so that the rocker arm 25 pushes the second plunger 23, and the second master brake pump 2 generates a hydraulic pressure to actuate the second brake caliper 4 to generate the interlocking brake. Because the inner wire 82 is pulled by the rotating shaft 122 through the pulley relationship, the maximum force obtained by the rocker arm 25 is only half of the force applied by the pulley, and the size of the brake cable 8, a thinner throttle wire may be used instead, and the first bushing 81 also uses a thinner throttle wire for the inner wire 82, therefore, the brake cable sleeve with higher rigidity is not needed to be used, so that the force applied to the actuating rod 15 by the first sleeve 81 generated by the tendency bending of the path in the assembly layout is relatively small, the normal action of the actuating rod 15 is not influenced, moreover, the force applied to the actuating rod 15 by the first sleeve 81 and the second sleeve 83 is the same as the force applied to the axle 122, i.e. the force applied to the first brake lever 12 by the rider, the actuating rod 15 can also apply the same force to the first plunger 13, and the system does not reduce the force applied to the first brake caliper 3 due to the linked braking effect.

Please refer to fig. 6 to 8, which are a cross-sectional view, an initial actuation cross-sectional view and a continued actuation cross-sectional view of a brake wire breaking state of a first master cylinder according to a first embodiment of the present invention. As shown in fig. 7, after the end 123 of the first brake lever 12 moves by the stroke S, the actuating rod 15 will not rotate due to the abnormal brake wire 8, and the pushing part 121 will approach the first pushing part 152. As shown in fig. 8, when the first brake lever 12 continues to apply force, the pushing portion 121 forces the first pushing portion 152 to rotate, so that the first master cylinder 1 provides a hydraulic pressure to brake the first brake caliper 3, and finally the vehicle still has a braking function without a general failure of the braking function.

Please refer to fig. 9 and 10, which are a schematic diagram of an interlocking brake system and a sectional view of a first master cylinder according to a second embodiment of the present invention. The drawing shows a linkage brake system, which mainly comprises a first brake master cylinder 1', a second brake master cylinder 2, a first brake caliper 3, a second brake caliper 4, a brake wire 8, a first brake oil pipe 6 and a second brake oil pipe 7. The first master cylinder 1' and the second master cylinder 2 are respectively used for controlling the braking systems of the front wheel and the rear wheel or controlling the braking systems of the front wheel and the rear wheel in a linkage manner.

The structural features of the coupled braking system are basically the same as those of the first embodiment, and are not repeated herein, except that the first master cylinder 1' of the present embodiment is slightly changed in structural configuration. As shown in the drawings, the first master cylinder 1 'includes a first cylinder 11, a first brake lever 12, an actuating rod 15' and a brake cable 8, the first cylinder 11 has a first oil chamber 14, a first plunger 13 and a first spring 16, the first oil chamber 14 is filled with hydraulic oil, when the first plunger 13 moves, the first spring 16 is compressed, and a part of the hydraulic oil in the first oil chamber 14 is pushed out of the first cylinder 11, so that the first master cylinder 1 generates an oil pressure. The actuating rod 15 'and the first cylinder 11 are pivotally connected to the first pivot point 111, and have a first wire fixing seat 151 and a first pushing portion 152 for pushing against the first plunger 13, the first pivot point 111 is located between the first wire fixing seat 151 and the first pushing portion 152, when the actuating rod 15' rotates, the first pushing portion 152 can push the first plunger 13 to move, the first brake lever 12 and the first cylinder 11 are pivotally connected to the second pivot point 112, the first brake lever 12 can be used by a rider to operate a brake, and the first brake lever 12 has an end portion 123, a pushing portion 121, and a rotating shaft 122.

In this embodiment, the brake wire 8 includes a first sleeve 81 and an inner wire 82 passing through the first sleeve 81, one end of the first sleeve 81 is disposed on the second cylinder 21, and the other end is disposed on the first wire fixing seat 151. The inner wire 82 has a first end 821 and a second end 822 at two ends, the first end 821 can pull the swing arm 25, the second end 822 is mounted on a fixing point 154 of the actuating rod 15', and a section of the inner wire 82 between the first sleeve 81 and the fixing point 154 must surround the rotating shaft 122.

Fig. 11 is a cross-sectional view of a first master cylinder according to a second embodiment of the present invention in an initial operating state. When the first brake lever 12 is initially operated, the actuating rod 15' is rotated by the combined force applied by the inner wire 82 and the first sleeve 81, so that the first master cylinder 1 sends an oil pressure to the first brake caliper 3, and the first brake caliper 3 generates a braking force.

Fig. 12 is a cross-sectional view showing a linkage braking state of a first master cylinder according to a second embodiment of the present invention. When the first brake lever 12 is continuously pressurized, the first plunger 13 exerts a reaction force on the actuating rod 15 ' to resist the rotation of the actuating rod 15 ', and the rotating shaft 122 is away from the actuating rod 15 ', so that the rocker arm 25 pushes the second plunger 23, and the second master cylinder 2 generates a hydraulic pressure to actuate the second brake caliper 4 to generate the interlocking brake.

Please refer to fig. 13 and 14, which are a schematic diagram of a linkage brake system according to a third embodiment of the present invention and a sectional view of a first master cylinder, respectively. The drawing shows a linkage brake system, which mainly comprises a first brake master cylinder 1 ", a second brake master cylinder 2, a first brake caliper 3, a second brake caliper 4, a brake wire 8, a first brake oil pipe 6 and a second brake oil pipe 7. The first master cylinder 1 ″ and the second master cylinder 2 are respectively used for controlling the braking systems of the front wheel and the rear wheel or controlling the braking systems of the front wheel and the rear wheel in a linkage manner.

The structural features of the coupled braking system are basically the same as those of the first embodiment, and are not repeated herein, except that the first master cylinder 1 ″ of the present embodiment is slightly changed in structural configuration. As shown in the figure, the first master cylinder 1 ″ includes a first cylinder 11, a first brake lever 12, an actuating rod 15 ″ and a brake wire 8, the first cylinder 11 has a first oil chamber 14, a first plunger 13 and a first spring 16, the first oil chamber 14 is filled with hydraulic oil, when the first plunger 13 moves, the first spring 16 is compressed, and a part of the hydraulic oil in the first oil chamber 14 is pushed out of the first cylinder 11, so that the first master cylinder 1 generates an oil pressure. The actuating rod 15 ″ and the first cylinder 11 are pivotally connected to the first pivot point 111, and a first pushing portion 152 is disposed to push against the first plunger 13, when the actuating rod 15 ″ rotates, the first pushing portion 152 can push the first plunger 13 to move, the first brake lever 12 and the first cylinder 11 are pivotally connected to the second pivot point 112, the first brake lever 12 can be operated by a rider to brake, and the first brake lever 12 has an end 123, a pushing portion 121, and a rotating shaft 122.

In this embodiment, the brake wire 8 includes a first sleeve 81 and an inner wire 82 passing through the first sleeve 81, one end of the first sleeve 81 is disposed on the second cylinder 21, and the other end is disposed on the first wire fixing seat 113 on the first cylinder 11. The inner wire 82 has a first end 821 and a second end 822 at two ends, the first end 821 can pull the swing arm 25, the second end 822 is mounted on a fixing point 154 of the actuating rod 15 ", and a section of the inner wire 82 between the first sleeve 81 and the fixing point 154 must surround the rotating shaft 122.

Fig. 15 is a sectional view of a first master cylinder according to a third embodiment of the present invention in an initial operating state. When the first brake lever 12 is initially operated, the actuating rod 15 ″ is rotated by the inner wire 82, so that the first master cylinder 1 sends a hydraulic pressure to the first brake caliper 3, and the first brake caliper 3 generates a braking force.

Fig. 16 is a cross-sectional view showing a linkage braking state of the first master cylinder according to the third embodiment of the present invention. When the first brake lever 12 is continuously pressurized, the first plunger 13 exerts a reaction force on the actuating rod 15 "to resist the rotation of the actuating rod 15", and the rotating shaft 122 is away from the actuating rod 15 "to make the rocker arm 25 push the second plunger 23, so that the second master cylinder 2 generates a hydraulic pressure to actuate the second brake caliper 4 to generate the interlocking brake.

The above-described embodiments are merely exemplary for convenience of description, and the scope of the claims of the present invention should be determined by the claims rather than by the limitations of the above-described embodiments.

Claims

1. A brake master cylinder for a linked brake system, comprising:

A first brake master cylinder includes a first cylinder, a first brake lever, an actuating rod and a brake wire, the first cylinder has a first oil chamber, a first plunger and a first spring , the first brake lever is pivotally connected to the first cylinder body, and is provided with a rotating shaft, the actuating rod is pivotally connected to the first cylinder body, and one end of the actuating rod has a first push portion for In order to push the first plunger, the brake wire includes a first sleeve, a second sleeve and an inner wire passing through the first sleeve and the second sleeve, the first sleeve and the second sleeve. One end of the second sleeve is respectively fixed on the actuating rod;

It is characterized in that: the inner wire section located between the first sleeve and the second sleeve surrounds the rotating shaft.

2. A brake master cylinder for a linked brake system, comprising:

A first brake master cylinder includes a first cylinder, a first brake lever, an actuating rod and a brake wire, the first cylinder has a first oil chamber, a first plunger and a first spring , the first brake lever is pivotally connected to the first cylinder body, and is provided with a rotating shaft, the actuating rod is pivotally connected to the first cylinder body, and one end of the actuating rod has a first push portion for In order to push the first plunger, the brake wire includes a first sleeve and an inner wire penetrated in the first sleeve, and one end of the first sleeve is fixed on the actuating rod;

It is characterized in that: one end of the inner wire is fixed on a fixed point of the actuating rod, and the inner wire section between the first sleeve and the fixed point surrounds the rotating shaft.

3. A brake master cylinder for a linked brake system, comprising:

A first brake master cylinder includes a first cylinder, a first brake lever, an actuating rod and a brake wire, the first cylinder has a first oil chamber, a first plunger and a first spring , the first brake lever is pivotally connected to the first cylinder body, and is provided with a rotating shaft, the actuating rod is pivotally connected to the first cylinder body, and one end of the actuating rod has a first push portion for In order to push the first plunger, the brake wire includes a first sleeve and an inner wire penetrated in the first sleeve, and one end of the first sleeve is fixed on the first cylinder;

4. The brake master cylinder for a linked brake system as claimed in any one of claims 1 to 3, wherein the linked brake system further comprises a second brake master cylinder comprising a second cylinder, a A second brake lever and a rocker arm, the second cylinder has a second oil chamber, a second plunger and a second spring, the second brake lever and the rocker arm are pivotally connected to the second cylinder , and the rocker arm has a second push portion for pushing the second plunger.

5. The brake master cylinder for a linked brake system as claimed in any one of claims 1 to 3, wherein the linked brake system further comprises a first brake caliper and a second brake caliper, the first brake The caliper is connected to the first cylinder by a first brake oil pipe, and the second brake caliper is connected to the second cylinder by a second brake oil pipe.