TWM653058U - brake master cylinder - Google Patents

Abstract

This invention is mainly related to a brake master cylinder, which is mainly composed of a pump body and a torque adjustment unit. This invention uses the fixed seat and movable seat of the torque adjustment unit to cooperate with the eccentric brake knob and deflection sleeve to adjust the torque angle and line distance of the push rod relative to the piston by deflection angle to change the strength of the brake torque. The mechanism components of the torque adjustment unit of this invention all have a reliable and stable fixed-point multi-stage torque adjustment mechanism, so that this invention can enhance the structural rigidity and stability, so as to greatly enhance the safety of driving.

Description

brake master cylinder

This invention is related to a brake master cylinder, which uses the fixed seat and movable seat of the torque adjustment unit to cooperate with the eccentric brake adjustment knob and deflection sleeve to adjust the torque angle and line distance of the push rod relative to the piston by the deflection angle.

According to the current motorcycles, for safety reasons, at least one brake device is installed. Regardless of whether it is a drum brake or a disc brake, the brake device usually includes a brake clamp, a brake handle and a brake cable. The brake handle is installed on a handle, and the brake cable is used to connect the brake clamp and the brake handle. However, the brake device controls the brake clamp to brake the wheel by pulling the brake handle on the brake cable, so as to control the wheel to slow down or stop. Therefore, the quality of the brake device will directly affect the braking response, especially when there is an emergency during riding, the braking action time will be life-threatening.

The known structure is such as the patent application No. 108212430 of the Republic of China, "Brake operating device with adjustable brake sensitivity", which mainly comprises a master cylinder body with a pressure cylinder, a piston is placed in the pressure cylinder, and the piston is located between the opening and the bottom of the pressure cylinder; one end of an intermediate actuator is pivoted to the master cylinder body and has a first through hole and a first pivot hole, the first through hole and the first pivot hole intersect; a pull rod has a second through hole and a second pivot hole, the second through hole corresponds to the first through hole, and the second pivot hole corresponds to the first pivot hole; a pivot has a piston adjustment screw hole, the pivot is penetrated through the first pivot hole and the second pivot hole, and the piston adjustment screw hole is aligned with the first through hole and the second pivot hole. Through hole; a piston adjustment rod includes a piston adjustment screw section and a push head, the push head abuts against the piston, the piston adjustment screw section is connected to the rear end of the push head and is screwed to the piston adjustment screw hole, the piston adjustment rod section is screwed forward or backward relative to the pivot to adjust the starting position of the piston in the cylinder, However, the torque adjustment between the brake pressure handle and the grip of the known structure, please refer to Figure 8A and Figure 8B of its patent specification, which adopts a wear-prone adjustment structure method such as a screw-turned screw abutting with a spring return, because the thread of the screw is easy to break due to long-term use, and the spring is more likely to be elastically fatigued due to long-term use and thermal expansion and contraction, which affects the safety of the vehicle during driving.

Therefore, in view of the problems existing in the above-mentioned conventional structures, how to develop an innovative structure that is more ideal and practical and can meet the ardent expectations of consumers is also the goal and direction that relevant industries must work hard to develop and break through; in view of this , the creator has many years of experience in the manufacturing, development and design of related products. After detailed design and careful evaluation based on the above goals, he finally arrived at a truly practical creation.

The main purpose of this invention is to provide a brake master cylinder, which is aimed at the conventional structure of the brake pressure lever and the grip, which uses a threaded screw to counteract the wear of the adjustment structure with a spring return. The thread of the screw is prone to breakage due to long-term use, and the spring is more prone to elastic fatigue due to long-term use and thermal expansion and contraction, so as to overcome the problem of safety problems that are known to affect driving.

This invention is a brake master cylinder, which mainly includes: a pump body with an oil chamber inside. A piston is movable inside the oil chamber. Two opposite pivot ears are provided at opposite positions on one side of the pump body. Inside the two pivot ears A pivot hole is provided respectively, and a pivot groove is provided between the two pivot ears. The pivot groove provides a torque adjustment unit pivoted therein. The torque adjustment unit includes: a fixed seat, and a horizontally disposed inside An open space. A long slot movable hole and a pivot slot are respectively provided on both sides of the open space to communicate with the open space. A fixed guide hole is longitudinally connected to the open space adjacent to the long slot movable hole; a movable slot is provided on both sides of the open space. The base is arranged in the open space of the fixed base. One side of the movable base is transversely provided with an open slot. The movable base is vertically provided with a connected open slot on the top and bottom surfaces corresponding to the position of the elongated slot movable hole of the fixed base. A guide hole is provided, and a deflection hole is longitudinally penetrated on the adjacent side of the guide hole on the top and bottom surfaces; A movable guide post penetrates the slotted movable hole assembled in the fixed base and the guide hole of the movable base respectively, and moves together with the movable base in the movable hole of the fixed base. The movable guide post is predetermined The section radially penetrates an axis hole, and the axis hole has an open slot on the side of the movable seat; a deflection sleeve is axially arranged in the deflection hole of the movable seat, and an eccentric non-centered deflection sleeve is penetrated at the eccentric part of the deflection sleeve. The circular hole, the eccentric non-circular hole is opposite to the pivot hole located in the pump body, the pivot hole, the fixed guide hole of the fixed base, and the eccentric non-circular hole are connected by a rotating knob. The shaft column is assembled in sequence; a push rod is axially assembled in the shaft hole of the movable guide column, and moves in synchronism with the movable guide column in the slotted movable hole of the fixed seat. One end of the push rod A push end is provided, and the push end is against the piston of the pump body; and a braking pressure handle is provided with a pivot seat, and the pivot seat is positioned in the pivot groove of the fixed seat.

In one embodiment, the fixed guide hole has a plurality of positioning holes spaced around the axis, and the plurality of positioning holes respectively define a first positioning hole, a second positioning hole and a third positioning hole, and the long slot movable hole of the fixed seat is provided with a first positioning area, a second positioning area and a third positioning area with equal line spacing relative to the first positioning hole, the second positioning hole and the third positioning hole of the plurality of positioning holes.

In one embodiment, a set of holes is provided between the fixed guide hole and the slotted movable hole of the fixed base. The set of holes can be used to assemble a stopper in the open space, and one side of the movable base A first blocking surface and a second blocking surface are provided on the end surface relative to the position of the limiting member.

In one embodiment, a screw hole is disposed adjacent to the eccentric non-circular hole of the deflection sleeve, and a positioning component is provided in the screw hole. The positioning component can form multiple segments with the multiple positioning holes of the fixed base. position.

The above-mentioned positioning assembly comprises a stud, an elastic member and a positioning bead, the stud is screwed to the screw hole of the deflection sleeve, wherein a groove is recessed inside the stud, the groove can accommodate and assemble the elastic member and the positioning bead, and the positioning bead is elastically embedded and positioned in the multi-stage positioning holes of the fixing seat.

In one embodiment, the eccentric non-circular hole of the deflection sleeve is provided with a chamfered surface on one side of the inner diameter surface, and the shaft of the rotary knob is also provided with a chamfered surface matching the chamfered surface; thereby, when the rotary knob is rotated, the shaft can drive the deflection sleeve to rotate.

In one embodiment, a knob for rotation is provided at the top of the knob, and a set of ends is provided at the bottom of the knob. After the shaft passes through the pivot hole at the bottom of the pump body, it is fixed by a fixing assembly.

In one embodiment, the movable guide column has a limiting edge at the top and a receiving hole connected to the shaft hole at the bottom. A bead, a spring and a coupling column are sequentially assembled in the receiving hole. The coupling column has a receiving area, and the bead and the spring are assembled in the receiving area. The section position of the push rod corresponding to the bead is defined as an axial section. The surface of the axial section is circumferentially arranged with a plurality of radial recesses, so that each radial recess corresponds to The bead is embedded, and a fixed section is extended at one end of the axial section. The radial position of the fixed section is provided with at least one pin positioning hole. The fixed section is provided with a through hole assembly of a rotating button. The rotating button is provided with a pin through hole corresponding to each of the pin positioning holes of the push rod. The pin through hole is connected to the through hole, so that the pin through holes are respectively provided with a positioning assembly pin and penetrated and fixed in the pin positioning hole of the push rod.

In one embodiment, a hinge ear is provided on each side of the hinge groove of the fixing seat, each hinge ear is provided with a hinge hole, and the hinge seat of the brake pressure handle is provided with a hinge assembly hole, and the hinge assembly hole is assembled correspondingly to the two hinge holes of the fixing seat, and is positioned by a hinge assembly through the hinge assembly.

Thus, the invention uses the fixed seat and movable seat of the torque adjustment unit to cooperate with the eccentric brake knob and deflection sleeve to adjust the torque angle and line distance of the push rod relative to the piston by the deflection angle. The starting position of the piston will not be changed during the torque adjustment. This invention only changes the brake torque feel. The mechanism components of the torque adjustment unit of this invention all have a reliable and stable fixed-point multi-stage torque adjustment mechanism, and do not adopt the commonly used adjustment structure methods such as screws and springs that are easy to wear. Instead, this invention can enhance the structural rigidity and stability, thereby greatly enhancing the safety of the vehicle while driving.

A: Torque adjustment unit

10: Pump body

11: Clamp seat

12: Pivot ears

13: Pivot hole

14: Pivot slot

15:piston

16:Oil chamber

20: Fixed seat

21: Open space

22: Long slot movable hole

221: First positioning area

222: Second positioning area

223: Third positioning area

23: Fixed guide hole

24:Multiple positioning holes

241: First positioning hole

242: Second positioning hole

243:Third positioning hole

25: Group hole

26: Limiting parts

27: Ear

271: hinge

28: Pivot slot

29: Limiting parts

291: Limiting hole

30: Movable guide pillar

31: Cylinder

32: Shaft hole

33: Limiting edge

34:Volume

35:Bead body

36:Spring

37: Binding column

38: Containment area

40: Movable seat

41: Deflection hole

42:Side open slot

43: Guide hole

44: First stop surface

45:Second stop surface

50: Deflection sleeve

51: Eccentric non-circular hole

52: Flat surface

53: screw hole

54:Turn knob

55: Knob

56: Axle

57:Group end

58: Noodles

59: Fixed components

60: Positioning assembly

61: Stud

62: Drive end

63: Elastic parts

64: Positioning beads

65: Storage tank

70: Putting

71: Axis rotation section

72: radial indentation

73: Push end

74: Fixed section

75: Pin positioning hole

76: Rotate button

77: Through hole

78: Pin through hole

79: Positioning pin assembly

80: Brake pressure handle

81:Pivot

82: hinge hole

83: Pivot component

90:Handle

Figure 1: This is a three-dimensional diagram of the master brake cylinder of this creation.

Figure 2: A partially exploded 3D diagram of the master brake cylinder of this creation.

Figure 3: This is a three-dimensional diagram of the brake master cylinder in detail.

Figure 4: This is a cross-sectional diagram of the master brake cylinder of this invention.

Figure 5: This is the first schematic diagram of the torque adjustment action of the master brake cylinder of this invention.

Figure 6: This is the second schematic diagram of the torque adjustment action of the master brake cylinder of this invention.

Figure 7: Schematic diagram 3 of the torque adjustment action of the brake master cylinder of this invention.

Figure 8: A cross-sectional view along line A-A in Figure 4.

Figure 9 is a schematic diagram of the cross-section corresponding to the schematic diagram of the cross-section in Figure 4.

Please refer to Figures 1 to 9, which are preferred embodiments of the master brake cylinder of the present invention. However, these embodiments are for illustrative purposes only and are not limited to this structure in patent applications. They include: a pump body 10, an oil chamber 16 is provided inside, a piston 15 is movably provided inside the oil chamber 16, two opposite pivot ears 12 are provided at opposite positions on one side of the pump body 10, a pivot hole 13 is respectively provided inside the two pivot ears 12, a pivot groove 14 is provided between the two pivot ears 12, and the pivot groove 14 is provided for the torque adjustment unit A to pivot therein; a clamping seat 11 is provided on one side of the pump body 10, and the clamping seat 11 can be used to clamp a handle 90.

The torque adjustment unit A comprises: a fixing seat 20, an open space 21 is disposed in the interior in a transverse direction, a long slot movable hole 22 connected to the open space 21 is disposed vertically through the top and bottom surfaces of the fixing seat 20, a fixing guide hole 23 is disposed vertically through the open space 21 adjacent to the long slot movable hole 22, and a plurality of positioning holes 24 are spaced around the axis of the fixing guide hole 23; a hinge 28 is disposed at one side end of the fixing seat 20; wherein the plurality of positioning holes 24 of the fixing seat 20 are respectively defined as a first positioning hole 241, a second positioning hole 242 and a third positioning hole 243 in the present embodiment, and the long slot movable hole 24 of the fixing seat 20 is disposed at a position of a plurality of positioning holes 241, a second positioning hole 242 and a third positioning hole 243. A first positioning area 221, a second positioning area 222 and a third positioning area 223 with equal line spacing are provided at positions of the first positioning hole 241, the second positioning hole 242 and the third positioning hole 243 of the multi-stage positioning hole 24; a set of holes 25 is provided between the fixed guide hole 23 of the fixing seat 20 and the long slot movable hole 22, and the set of holes 25 can be used to assemble a limit stopper 26 in the open space 21; a hinge ear 27 is provided on both sides of the hinge 28 of the fixing seat 20, and each hinge ear 27 is provided with a hinge hole 271; a limit hole 291 is provided horizontally on one side of the hinge 28, and a limiter 29 is provided in the limit hole 291.

A movable seat 40 is arranged in the open space 21 of the fixed seat 20. One side of the movable seat 40 is laterally provided with an open slot 42. The movable seat 40 corresponds to the top of the long slot movable hole 22 of the fixed seat 20. , the bottom surface is longitudinally penetrated with a guide hole 43 that communicates with the open slot, and the adjacent side of the guide hole 43 is longitudinally penetrated with a deflection hole 41 on the top and bottom surfaces; a first stopper is provided on one side end surface of the movable seat 40 The stop surface 44 and a second stop surface 45 are used to relatively block the position of the stopper 26 of the fixed seat 20 and prevent the movable seat 40 from being detached due to excessive rotation.

A movable guide post 30 penetrates the long slot movable hole 22 assembled on the fixed seat 20 and the guide hole 43 of the movable seat 40 respectively, and moves with the movable seat 40 in the movable hole of the fixed seat 20. The movable guide post 30 radially penetrates an axial hole 32 in a predetermined section, and the axial hole 32 is located opposite to the side open slot 42 of the movable seat 40; wherein the movable guide post 30 includes a column 31 and a limiting edge 33 arranged on the top of the column 31, and a receiving hole 34 connected to the axial hole 32 is arranged at the bottom, and a bead 35, a spring 36 and a coupling post 37 are sequentially assembled inside the receiving hole 34, and a receiving area 38 is arranged inside the coupling post 37, so that the bead 35 and the spring 36 are assembled in the receiving area 38.

A deflection sleeve 50 is axially disposed in the deflection hole 41 of the movable seat 40. An eccentric non-circular hole 51 is formed at the eccentric portion of the deflection sleeve 50. The eccentric non-circular hole 51 is located opposite to the pivot hole 13 of the pump body 10. The pivot hole 13, the fixed guide hole 23 of the fixed seat 20, and the eccentric non-circular hole 51 are sequentially penetrated and assembled by a shaft 56 connected to the lower side of a rotary knob 54. A screw hole 53 is formed adjacent to the eccentric non-circular hole 51. The screw hole 53 is formed around the shaft 56. The eccentric non-circular hole 51 of the deflection sleeve 50 is in the shape of a circular hole and has a beveled surface 52 on one side, and the shaft 56 of the rotary knob 54 is also provided with a beveled surface 58 that matches the cross-sectional shape of the beveled surface 52 of the eccentric non-circular hole 51. In addition, a knob 55 for rotation is provided at the top of the rotary knob 54, and a set of ends 57 is provided at the bottom of the rotary knob 54. After the shaft 56 passes through the pivot hole 13 at the bottom of the pump body 10, it is assembled and fixed by a fixing assembly 59.

A positioning assembly 60, the shaft assembly is in the screw hole 53 of the deflection sleeve 50, and performs a circular motion around the shaft 56 as the axis, and performs a circular multi-stage positioning in the multi-stage positioning hole 24 of the fixing seat 20; wherein the positioning assembly 60 comprises a stud 61, an elastic member 63 and a positioning bead 64, wherein the stud 61 is fixed to the screw hole 53 of the deflection sleeve 50 by the screw assembly, wherein a receiving groove 65 is concavely provided inside the stud 61, wherein the receiving groove 65 can accommodate and assemble the elastic member 63 and the positioning bead 64, wherein the positioning bead 64 is multi-stage elastically embedded and positioned in the multi-stage positioning hole 24 of the fixing seat 20, and a driving end 62 is provided on the top surface of the head end of the stud 61.

A push rod 70 is axially assembled in the axial hole 32 of the movable guide column 30 and moves synchronously with the movable guide column 30 in the long slot movable hole 22 of the fixing seat 20. A push end 73 is provided at one end of the push rod 70, and the push end 73 is against the piston 15 of the pump body 10. The push rod 70 is also provided at a position corresponding to the section of the bead 35 of the movable guide column 30. The rotating section 71 is defined as a rotating section 71. The rotating section 71 is provided with a plurality of radial recesses 72 on its surface. Each of the radial recesses 72 is corresponding to the bead 35. A fixing section 74 is provided at one end of the rotating section 71. The fixing section 74 is provided with at least one pin positioning hole 75 at a radial position. The fixing section 74 is provided with a through hole 77 for fixing a rotating button 76. The button 76 is provided with a pin through hole 78 at a position corresponding to each of the pin positioning holes 75 of the push rod 70, and the pin through hole 78 is connected to the through hole 77, so that the pin through hole 78 is respectively provided with a positioning pin 79 and is inserted and fixed in the pin positioning hole 75 of the push rod 70; and a brake pressure handle 80, having a hinge 81, and the hinge 81 is hinged to the fixing base 20. The brake lever 80 is positioned in the hinge groove 28. A limiter 29 is provided inside the hinge groove 28. The limiter 29 can prevent the brake lever 80 from being disengaged due to excessive displacement. The hinge seat 81 of the brake lever 80 is provided with a hinge assembly hole 82. The hinge assembly hole 82 is assembled correspondingly to the two hinge holes 271 of the fixing seat 20, and is relatively positioned through a hinge assembly 83.

The invention mainly uses the torque adjustment unit A to adjust the relative torque line distance between the brake pressure lever 80 and the handle 90. As shown in FIG. 4 and FIG. 5, the relative torque line distance between the brake pressure lever 80 and the handle 90 is a shorter stroke h1. In the adjustment state, the user must first manually adjust the position of the knob 55 of the adjustment knob 54, and use the bevel 5 of the shaft 56 to adjust the relative torque line distance. 8 to drive the chamfered surface 52 of the eccentric non-circular hole 51 of the deflection sleeve 50, and the rotary knob 54 uses the fixed guide hole 23 of the fixed seat 20 as the pivot axis to drive the deflection sleeve 50 to rotate eccentrically inside the deflection hole 41 of the movable seat 40. When the deflection sleeve 50 deflects, the positioning bead 64 of the positioning assembly 60 is swing-engaged and positioned in the first positioning hole 241 of the multi-stage positioning hole 24. At the same time, the movable seat 40 is also pushed laterally by the deflection sleeve 50 to make a lateral displacement in the open space 21 in the fixed seat 20. When the movable seat 40 is displaced, the movable guide post 30 provided in the guide hole 43 thereof is also displaced to the first positioning area 221 in the long slot movable hole 22 of the fixed seat 20. At the same time, the movable guide post also drives the push rod 70 to push the end 7 3 and the piston 15 of the pump body 10 are centrally swiveled and displaced. Since the push end 73 is in the shape of a ball head, a ball socket is also provided at the position of the piston 15 relative to the push end 73, and the reverse force is applied to link the fixed seat 20 and the brake pressure handle 80 to change the relative force application moment line distance position with the handle 90 to be h1. In addition, the first stop surface 44 of the movable seat 40 is used to stop the stopper 26 of the fixed seat 20.

As shown in FIG. 6 , the relative torque line distance between the brake pressure lever 80 and the grip 90 is the middle stroke between the strokes h1 in FIG. 4 and h2 in FIG. 9 . In the adjustment state, the user must first manually adjust the position of the knob 55 of the adjustment knob 54 to deflect the deflection sleeve 50 so that the positioning bead 64 of the positioning assembly 60 is rotated and inserted into the second positioning hole 242 of the multi-stage positioning hole 24. At the same time, the movable seat 40 is also pushed laterally by the deflection sleeve 50 and moves laterally in the open space 21 in the fixed seat 20 to the second positioning area 222 of the long slot movable hole 22.

As shown in FIG. 7 and FIG. 9, the relative torque line distance between the brake pressure handle 80 and the grip 90 is a relatively long stroke h2. When the position of the knob 55 of the rotary knob 54 is adjusted, the beveled surface 58 of the shaft column 56 is used to drive the beveled surface 52 of the eccentric non-circular hole 51 of the deflection sleeve 50, and the rotary knob 54 uses the fixed guide hole 23 of the fixed seat 20 as the pivot axis to drive the deflection sleeve 50 to rotate eccentrically inside the deflection hole 41 of the movable seat 40. When the deflection sleeve 50 deflects, the positioning bead 64 of the positioning assembly 60 is rotated and inserted into the third positioning hole 243 of the multi-stage positioning hole 24. At the same time, the movable seat 40 is also pushed horizontally by the deflection sleeve 50 to move in the open space in the fixed seat 20. When the movable seat 40 is displaced, the movable guide post 30 provided in the guide hole 43 of the fixed seat 20 is also displaced to the third positioning area 223 in the long groove movable hole 22 of the fixed seat 20. At the same time, the movable guide post 30 also drives the push rod 70 to rotate and displace around the push end 73 and the piston 15 of the pump body 10. Because the push end 73 is in the shape of a ball head, the piston 15 is relatively close to the push end. A ball-shaped socket is also provided at position 73, which is used to reversely apply force to link the fixed seat 20 and the brake handle 80 to change the relative force moment line distance position with the handle 90 to h2. FIG9 shows that the axis of the push rod 70 is inclined to the axis of the piston 15 inside the pump body 10, and the second stop surface 45 of the movable seat 40 is used to stop the stopper 26 of the fixed seat 20.

In this way, this invention uses the fixed seat 20 and the movable seat 40 of the torque adjustment unit A to cooperate with the eccentric braking knob 54 and the deflection sleeve 50 to adjust the torque angle and line of the push rod 70 relative to the piston 15 by the deflection angle. distance, the starting position of the piston 15 will not be changed when adjusting the torque. This invention only purely changes the braking torque feel. The mechanical components of the torque adjustment unit A of this invention all have a reliable and stable fixed-point multi-stage torque adjustment. The mechanism does not adopt the conventional screw-fit spring 36 and other adjustment structural methods that are easy to wear, but this invention can increase the structural rigidity and stability, thereby greatly improving the safety of driving.

A: Torque adjustment unit

10: Pump body

20: Fixed seat

22: Long slot movable hole

30: Movable guide pillars

40:movable seat

54: Knob

76: Rotate button

80: Brake pressure handle

81:Pivot

83: Pivot component

90: Grip

Claims (9)

A brake master cylinder comprises: a pump body, an oil chamber is arranged inside, a piston is movably arranged inside the oil chamber, two pivot ears are arranged at opposite positions on one side of the pump body, a pivot hole is respectively penetrated inside the two pivot ears, a pivot groove is arranged between the two pivot ears, and a torque adjustment unit is pivotally arranged in the pivot groove, wherein the torque adjustment unit comprises: a fixing seat, an open space is arranged horizontally inside, and a connecting hole is respectively penetrated on both sides of the open space. The invention relates to a long slot movable hole and a hinged slot in the open space, wherein a fixed guide hole connected to the open space is longitudinally arranged adjacent to the long slot movable hole; a movable seat is arranged in the open space of the fixed seat, and a side open slot is transversely arranged on one side of the movable seat, and a guide hole connected to the open slot is longitudinally arranged on the top and bottom surfaces of the movable seat corresponding to the position of the long slot movable hole of the fixed seat, and a deflection hole is longitudinally arranged on the top and bottom surfaces adjacent to the guide hole; an movable seat is arranged in the open space of the fixed seat, and a side open slot is transversely arranged on one side of the movable seat, and a guide hole is longitudinally arranged on the top and bottom surfaces of the movable seat corresponding to the position of the long slot movable hole of the fixed seat, and a deflection hole is longitudinally arranged on the top and bottom surfaces of the movable seat; A guide post is respectively passed through the long slot movable hole assembled on the fixed seat and the guide hole of the movable seat, and is displaced together with the movable seat in the movable hole of the fixed seat. The movable guide post radially passes through an axial hole in a predetermined section, and the axial hole is located opposite to the side open slot of the movable seat; a deflection sleeve is axially arranged on the deflection hole of the movable seat, and an eccentric non-circular hole is passed through the eccentric part of the deflection sleeve, and the eccentric non-circular hole is located opposite to the pivot of the pump body. The pivot hole, the fixed guide hole of the fixed seat, and the eccentric non-circular hole are assembled in sequence through the shaft of a rotary knob; a push rod is axially assembled in the shaft hole of the movable guide column and moves synchronously with the movable guide column in the long slot movable hole of the fixed seat. A push end is provided at one end of the push rod, and the push end is against the piston of the pump body; and a brake pressure handle has a pivot seat, and the pivot seat is pivotally assembled and positioned in the pivot groove of the fixed seat. As described in claim 1, the master brake cylinder has multiple positioning holes spaced around the axis of the fixed guide hole, and the multiple positioning holes define a first positioning hole, a second positioning hole and a third positioning hole, respectively. The long slot movable hole of the fixed seat is provided with a first positioning area, a second positioning area and a third positioning area with equal line spacing relative to the first positioning hole, the second positioning hole and the third positioning hole of the multiple positioning holes. The master brake cylinder as described in claim 1, wherein a set of holes is provided between the fixed guide hole of the fixed seat and the long slot movable hole, the set of holes can be used to assemble a limit stop member in the open space, and a first stop surface and a second stop surface are provided on a side end surface of the movable seat relative to the position of the limit stop member. The brake master cylinder of claim 1, wherein a screw hole is provided adjacent to the eccentric non-circular hole of the deflection sleeve, and a positioning component is provided in the screw hole, and the positioning component can be connected with the fixed seat. The multi-stage positioning holes form multi-stage positioning. The brake master cylinder of claim 4, wherein the positioning component respectively includes a stud, an elastic member and a positioning ball, and the stud is fixed to the screw hole of the deflection sleeve by a screw assembly, wherein the A groove is recessed inside the stud, and the groove can accommodate the assembly of the elastic member and the positioning bead. The positioning bead is elastically inserted and positioned in the multi-section positioning holes of the fixed base. The master brake cylinder as described in claim 1, wherein the eccentric non-circular hole of the deflection sleeve is provided with a chamfered surface on one side of the inner diameter surface, and the shaft of the rotary knob is also provided with a chamfered surface matching the chamfered surface. The brake master cylinder of claim 1, wherein the top of the knob is provided with a knob for rotation, and the bottom of the knob is provided with a set of ends. When the shaft passes through the bottom of the pump body, After the pivot hole is formed, a fixed component is assembled and fixed. The brake master cylinder of claim 1, wherein the top of the movable guide post is provided with a limiting edge, and the bottom is provided with a hole connected to the shaft hole, and a bead, a spring and a hole are sequentially assembled inside the hole. The combination column is provided with a receiving area, so that the bead body and the spring are assembled in the receiving area, and the section position of the push rod corresponding to the bead body is defined as an axial rotation section, and the axial rotation section There are a plurality of radial indentations on the surface, so that each radial indentation corresponds to the bead body. A fixed section is extended from one end of the axis section, and the diameter of the fixed section is At least one pin positioning hole is provided at the opposite position. The fixed section is provided with a through hole of a rotating button. The rotating button is provided with a pin through hole corresponding to the position of each pin positioning hole of the push rod. The pin penetrates The holes are connected to the through holes, so that the pin through holes are respectively equipped with a positioning set of pins and are inserted and fixed in the pin positioning holes of the push rod. As described in claim 1, the master brake cylinder has a hinge ear on each side of the hinge groove of the fixing seat, each hinge ear has a hinge hole, and the hinge of the brake lever has a hinge assembly hole, which is assembled correspondingly to the two hinge holes of the fixing seat and is positioned by a hinge assembly through the hinge assembly.

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