CN216969898U - Variable oil pressure brake structure - Google Patents

Abstract

The utility model discloses a variable oil pressure brake structure, which relates to an oil pressure brake system. The variable hydraulic brake structure comprises: the oil outlet is communicated with the movable space; a first piston, which is arranged in the movable space of the body and can move between a first position and a second position along the movable space; the first piston is provided with a driving part; the second piston is arranged in the movable space of the body and can move between a third position and a fourth position along the movable space; the second piston is provided with a driven part; when the first piston is located at the first position and the second piston is located at the third position, the driving part of the first piston is separated from the driven part of the second piston by a preset distance; and a brake handle pivoted to the body for driving the first piston to move. The pressing hand feeling of the brake handle can be provided to a user more safely and flexibly.

Description

Variable oil pressure brake structure

Technical Field

The present invention relates to a hydraulic brake system, and more particularly to a variable hydraulic brake structure capable of improving the hand feeling and safety of a brake handle by multi-stage hydraulic pressure.

Background

The traditional bicycle mainly uses a ring brake type brake, but in recent years, more and more manufacturers choose to install a disc brake type brake on the bicycle. Wherein, the dish formula brake of stopping divide into again that machinery dish stops and oil pressure dish is stopped two kinds: the mechanical disc brake utilizes the steel cable to fix the brake handle, and the steel cable pulls the single-side brake pad to approach the disc during braking, thereby achieving the braking effect. The oil pressure dish is stopped and is used the hydraulic pressure principle, sees through inside piston promotion brake oil when the handle pushes down, and then promotes the piston in the calliper, and then the brake of dish is carried to the lining of pulling both sides, comes to brake.

The hydraulic brake includes single piston actuation and multi-piston actuation, for example, taiwan patent M504052 discloses a single-piston hydraulic brake structure, which includes a hydraulic cylinder, a piston and a handle. The piston is movably arranged in the oil pressure cylinder, the handle is connected with the piston through a connecting rod, and when a user applies a pressing force to the handle, the piston can push hydraulic oil in the oil pressure cylinder to provide braking force. In addition, taiwan patent I404650 discloses a dual-piston hydraulic handle set, which includes a body, an L-shaped pressing handle, a first piston module and a second piston module. The body is provided with a first accommodating space and a second accommodating space. The L-shaped pressing handle is pivoted to one end of the body, and the other part of the L-shaped pressing handle is respectively connected to the first piston and the second piston. The first piston module is arranged in the first accommodating space; and the second piston module is arranged in the second accommodating space. When a pressing force is applied to the L-shaped pressing bar, the first piston module and the second piston module are simultaneously pushed to generate a first stroke and a second stroke.

The common problem of the single-piston hydraulic brake is that there is only one braking force, and if the diameter of the piston is too small, the user is easily locked by applying too much braking force during emergency braking, which is dangerous. The common problem of the above-mentioned dual-piston hydraulic brake is that the dual pistons provide a large thrust, but the total area of the pistons affected by the hydraulic oil is increased by driving the dual pistons at the same time, so that the pistons can generate enough oil pressure to maintain the clamping force of the caliper with a large force, and the user needs to apply a larger pressing hand feeling, which is quite laborious.

SUMMERY OF THE UTILITY MODEL

The main objective of the present invention is to provide a variable hydraulic brake structure, which can adjust the braking force by multi-stage hydraulic pressure, so as to improve the pressing feel and safety of the brake handle.

To achieve the above object, the present invention provides a variable hydraulic brake structure, comprising: the oil outlet is communicated with the movable space; a first piston, which is arranged in the movable space of the body and can move between a first position and a second position along the movable space; the first piston is provided with a driving part; the second piston is arranged in the movable space of the body and can move between a third position and a fourth position along the movable space; the second piston is provided with a driven part; when the first piston is located at the first position and the second piston is located at the third position, the driving part of the first piston is separated from the driven part of the second piston by a preset distance; and a brake handle pivoted to the body for driving the first piston to move; therefore, when the brake handle is operated to enable the first piston to move the preset distance from the first position to the second position, the driving part of the first piston can act on the driven part of the second piston; when the first piston continues to move to the second position, the first piston drives the second piston to move to the fourth position.

In one embodiment, the first piston is movable relative to the second piston such that the second piston remains in the third position when the brake lever is operated to move the first piston from the first position to the second position by less than or equal to the predetermined distance.

In one embodiment, the first piston has a tail portion and a body portion, the outer diameter of the body portion is smaller than that of the tail portion, and the driving portion is located on one end face of the tail portion adjacent to the body portion; the driven part of the second piston is positioned on one end surface of the second piston facing the driving part.

In one embodiment, the second piston is annular and is sleeved on the body of the first piston in the circumferential direction, and the outer diameter of the second piston is larger than that of the body.

In one embodiment, the piston further comprises a first elastic element disposed in the movable space of the body, one end of the first elastic element abuts against the body, and the other end of the first elastic element abuts against the first piston; and a second elastic piece is arranged in the movable space of the body, one end of the second elastic piece is propped against the body, and the other end of the second elastic piece is propped against the second piston.

In one embodiment, the outer diameter of the second elastic member is larger than the outer diameter of the first elastic member, and the first elastic member extends into the second elastic member, so that the second elastic member is sleeved around the first elastic member.

In one embodiment, the first piston has a head portion extending into the first resilient member such that the first resilient member is disposed around the head portion.

In one embodiment, the brake handle has an adjusting member pivotally connected to one end of the body; the first piston is provided with a push rod, and one end of the push rod is abutted against the adjusting piece of the brake handle.

In one embodiment, the body further has a first adjusting screw sleeved outside the first piston; when the first adjusting screw moves towards the direction close to or far away from the body, the push rod of the first piston can push the adjusting piece, so that the angle of the brake handle is changed.

In one embodiment, the push rod is integrally formed with the first piston.

The variable oil pressure brake structure of the utility model has the effect of providing a multi-section oil pressure mode, when the distance of the first piston moving from the first position to the second position is less than the preset distance, the first piston with smaller outer diameter pushes hydraulic oil, a user applies smaller force (micro pressure) to drive the first piston to generate oil pressure, and the force of the oil pressure brake caliper clamping a brake disc is lighter; when the distance that the first piston moves from the first position to the second position is greater than the preset distance, the first piston pushes the second piston to move together, and the first piston and the second piston push hydraulic oil together by adding the second piston with a larger outer diameter, so that a user needs to apply a larger force (heavy pressure) to the brake handle to generate a braking force, and the situation that the user brakes hard and locks due to the fact that the user applies a hard brake is prevented. Through the multi-section type oil pressure brake system, the pressing hand feeling of the brake handle which is safer and more flexible for users is provided.

The following description is of preferred embodiments of the utility model in accordance with the purpose, function and structural configuration disclosed herein and illustrated in the accompanying drawings.

Drawings

Fig. 1 is a perspective view of a preferred embodiment of the present invention.

Fig. 2 is a cross-sectional view of a preferred embodiment of the present invention, showing the first piston and the second piston at the first position and the third position, respectively.

FIG. 3 is a schematic cross-sectional view of the first piston of FIG. 2 moving a predetermined distance from the first position to the second position and contacting the second piston.

Fig. 4 is a schematic cross-sectional view illustrating the first piston and the second piston of fig. 2 moving to a second position and a fourth position, respectively.

Description of the main reference numerals:

10 main body 22 body

11 end of the activity space 23

12 oil outlet 24 push rod

13 opening 25 drive

14 groove 26 first elastic member

15 oil storage space 30 second piston

16 communication port 31 driven part

17 fixed part 32 oil seal ring

18 first adjusting screw 33 second elastic member

20 first piston 40 brake handle

21 head 41 adjuster

42 second adjusting screw 150 deformation piece

110 first flange 240 abutment

111 second flange 410 abutting surface

140 oil storage cover

Detailed Description

Referring to fig. 1 and 2, the variable hydraulic brake structure provided by the present invention is installed on a bicycle in the present embodiment, and is illustrated by a left brake lever, but the present invention is not limited to the left brake lever, and the right brake lever is also applicable; the present invention is not limited to being mounted on a bicycle, and any power device having a hydraulic brake system may be applied thereto, as will be described herein. The present invention provides a variable hydraulic brake structure, which mainly comprises: a body 10, a first piston 20, a second piston 30 and a brake handle 40.

The body 10 is generally tubular and has an active space 11 and an oil outlet 12 therein. The main body 10 further has an opening 13 disposed at one side of the main body 10 and connected to the movable space 11. The oil outlet 12 is located on the other side of the movable space 11 opposite to the opening 13, and is also communicated with the movable space 11, and the movable space 11 and the oil outlet 12 are filled with hydraulic oil. One side of the body 10 has a groove 14, an oil storage cover 140 is fixed on the top surface of the groove 14 by screws, and the oil storage cover 140 and the groove 14 together enclose an oil storage space 15. The main body 10 is further provided with two communication ports 16 between the movable space 11 and the oil storage space 15, and the two communication ports 16 communicate the movable space 11 and the oil storage space 15. A deformation member 150 is further provided in the oil storage space 15 to be deformed according to the amount of oil in the oil storage space 15. The two communication ports 16 allow part of the hydraulic oil to move between the movable space 11 and the oil storage space 15, preventing the oil pressure from being locked. The reservoir 15 is well known in the art and will not be described in detail herein. The main body 10 further has a generally annular fixing member 17, and the fixing member 17 is configured to be sleeved on a grip (not shown) of the bicycle to fix the main body 10 to the grip.

The first piston 20 is disposed at a first position (as shown in fig. 2) in the movable space 11 of the body 10. The first piston 30 has a head 21, a body 22, a tail 23 and a push rod 24 integrally formed therewith. The head 21 is the portion of the first piston 20 closest to the oil outlet 12. The body 22 is connected to a side of the head 21 away from the oil outlet 12, and an outer diameter of the body 22 is larger than an outer diameter of the head 21. The tail portion 23 is connected to a side of the body portion 22 away from the head portion 21, and an outer diameter of the tail portion 23 is larger than an outer diameter of the body portion 22. One end of the push rod 24 is connected to the tail portion 23 at a side away from the body portion 22, and the other end has a propping member 240, in the embodiment, the propping member 240 is embedded in the push rod 24, and in another embodiment, the push rod 24 can also be integrally formed. The first piston 20 further has a driving portion 25, and in the present embodiment, the driving portion 25 is disposed on an end surface of the tail portion 23 adjacent to the body portion 22.

The body 10 has a first flange 110 at a position where the movable space 11 is connected to the oil outlet 12, and a first elastic element 26 is disposed in the movable space 11 of the body 10, one end of which abuts against the first flange 110, and the other end of which is sleeved around the head 21 of the first piston 20 and abuts against an end surface of the body 22 adjacent to the head 21.

The second piston 30 is located at a third position (as shown in fig. 2) of the movable space 11 of the body 10, is generally annular, and is movably sleeved on the circumference of the body 22 of the first piston 20. The outer diameter of the second piston 30 is larger than the outer diameter of the body 22 of the first piston 20, for example, in the embodiment, the outer diameter of the body 22 of the first piston 20 is 15mm, and the outer diameter of the second piston 30 is 20 mm. The second piston 30 has a driven portion 31, and in the present embodiment, the driven portion 31 is located on an end surface of the second piston 30 facing the driving portion 25. When the first piston 20 is located at the first position and the second piston 30 is located at the third position, the driven portion 31 of the second piston 30 is separated from the driving portion 25 of the first piston 20 by a predetermined distance, so that the second piston 30 can move relative to the first piston 20. The second piston 30 is further provided with two oil seal rings 32, and the two oil seal rings 32 are used for preventing the liquid oil in the movable space 11 from leaking out of the side surface of the second piston 30.

The body 10 also has a second flange 111 near the first flange 110 at the movable space 11, and the second flange 111 is far from the oil outlet 12 than the first flange 110. A second elastic element 33 is disposed in the movable space 11, and one end of the second elastic element abuts against the second flange 111, and the other end of the second elastic element abuts against an end surface of the second piston 30 away from the driven portion 31. The second elastic member 33 surrounds the first elastic member 26, and the outer diameter of the second elastic member 33 is larger than the outer diameter of the first elastic member 26.

The brake handle 40 is generally L-shaped and movably pivoted to one end of the main body 10, a generally hook-shaped adjusting member 41 is disposed inside one end of the brake handle 40 adjacent to the main body 10 and is also pivoted to one end of the main body 10, a side of the adjusting member 41 adjacent to the main body 10 has a top surface 410, and the top surface 410 abuts against the top member 240 of the first piston 20. When the brake handle 40 is pressed, the abutting surface 410 of the adjusting member 41 pushes the abutting member 240 of the first piston 20, so as to drive the first piston 30 to move toward the oil outlet 12.

In addition, the main body 10 further has a first adjusting screw 18, which is locked at the opening 13 of the main body 10 and is sleeved around the tail 23 and the push rod 24 of the first piston 20. The brake handle 40 further has a second adjusting screw 42 fixed to one end of the adjusting member 41 of the brake handle 40. By adjusting the first adjusting screw 18 and the second adjusting screw 42, the angle of the brake handle 40 can be further adjusted to meet the habit of the user. For example, when the first adjusting screw 18 is screwed out in a direction away from the body 10, the adjusting member 41 is also pushed out by the first piston 20 to move the brake handle 40 away from the grip, and the second adjusting screw 42 is also adjusted to lock in with the adjusted adjusting member 41 to fix the adjusting member 41 again. At this time, the first piston 20 can move outwards from the original first position to a new first position, and the predetermined distance between the driving portion 25 of the first piston 20 and the driven portion 31 of the second piston 30 is adjusted to a new predetermined distance.

The utility model is formed by combining the above component structures, and provides a variable hydraulic brake structure. The practical operation and application are as follows:

the user can move the first piston 20 from the first position (shown in FIG. 2) to a second position (shown in FIG. 4) by pressing the brake lever 40. Referring to fig. 2, when the brake handle 20 is not pressed, the first piston 20 is located at the first position, the second piston 30 is located at the third position, the driving portion 25 of the first piston 20 is spaced from the driven portion 31 of the second piston 30 by the predetermined distance, and the first elastic member 26 and the second elastic member 33 are both in an uncompressed state. Then, a pressing force is applied to the brake lever 40, and the adjusting member 41 pushes the first piston 20 to move the first piston 20 from the first position to the second position. When the distance of the first piston 20 is smaller than the predetermined distance, the driving portion 25 of the first piston 20 does not contact the driven portion 31 of the second piston 30, so that the hydraulic oil in the movable space 11 is pressurized only by the movement of the first piston 20 with a smaller outer diameter relative to the second piston 30 in the movable space 11, and the body 22 of the first piston 20 compresses the first elastic member 26, so that the area for pushing the hydraulic oil is the cross-sectional area of the body 22 of the first piston 20. Therefore, in this case, a small force (micro-pressure) applied to the brake handle 40 can generate enough oil pressure in the first piston 20 to quickly generate a light braking force.

Referring to fig. 3, when the first piston 20 moves from the first position to the second position by the predetermined distance, the driving portion 25 of the first piston 20 contacts the driven portion 31 of the second piston 30. Then, as shown in fig. 4, when a greater pressing force is applied to the brake lever 40, the adjusting member 41 will continue to push the first piston 20 to move the first piston 20 to the second position, and when the distance that the first piston 20 moves from the first position to the second position is greater than the predetermined distance, the driving portion 25 of the first piston 20 will drive the driven portion 31 of the second piston 30 to move the second piston 30 from the third position (shown in fig. 2) to a fourth position (shown in fig. 4). At this time, the first piston 20 and the second piston 30 will compress the first elastic element 26 and the second elastic element 33 respectively, so that the first piston 20 and the second piston 30 push hydraulic oil together, and the area of the hydraulic oil pushed is the body 22 of the first piston 20 plus the cross-sectional area of the second piston 30, therefore, a brake disc (not shown) can be clamped by a brake caliper with a larger brake force to perform braking. Therefore, in this case, the user needs to apply a large force (heavy pressure) to the brake lever 40 to generate the braking force, thereby preventing the user from braking hard due to hard braking.

When the user releases the brake handle 40, the first elastic member 26 provides a first elastic force to move the first piston 20 from the second position shown in fig. 4 to the first position shown in fig. 2; the second elastic member 33 also provides a second elastic force to drive the second piston 30 to return from the fourth position shown in fig. 4 to the third position shown in fig. 2, and the distance between the driving portion 25 of the first piston 20 and the driven portion 31 of the second piston 30 also returns to the predetermined distance.

In summary, the variable hydraulic brake structure provided by the present invention provides a multi-stage hydraulic mode, which drives the first piston 20 to move from the first position to the second position, and drives the second piston 30 to move from the third position to the fourth position via the first piston 20 after the second piston 30 is contacted therebetween. When the distance that the first piston 20 moves from the first position to the second position is less than the predetermined distance, the first piston 20 with a smaller outer diameter pushes the hydraulic oil, so that the user applies a smaller force (micro pressure) to drive the first piston 20 to generate oil pressure, and the force of the oil pressure brake caliper clamping the brake disc is lighter; when the distance that the first piston 20 moves from the first position to the second position is greater than the predetermined distance, the first piston 20 will push the second piston 30 to move together, and the second piston 30 with a larger outer diameter is added, so that the first piston 20 and the second piston 30 push hydraulic oil together, and thus a user needs to apply a larger force (heavy pressure) to the brake handle 40 to generate a braking force, thereby preventing a deadlock situation caused by a user applying a hard brake. Through the multi-section type oil pressure brake system, the pressing hand feeling of the brake handle which is safer and more flexible for users is provided.

The above examples are merely illustrative of the techniques and their efficacy and are not intended to limit the utility model. It is to be noted that the present invention is not limited to the above-described embodiments, and various modifications and changes can be made by those skilled in the art without departing from the technical principle and spirit of the present invention.

Claims (10)

1. A variable hydraulic brake structure, comprising:

the oil outlet is communicated with the movable space;

a first piston, which is arranged in the movable space of the body and can move between a first position and a second position along the movable space; the first piston is provided with a driving part;

the second piston is arranged in the movable space of the body and can move between a third position and a fourth position along the movable space; the second piston is provided with a driven part; when the first piston is located at the first position and the second piston is located at the third position, the driving part of the first piston is separated from the driven part of the second piston by a preset distance; and

a brake handle pivoted to the body for driving the first piston to move;

therefore, when the brake handle is operated to enable the first piston to move the preset distance from the first position to the second position, the driving part of the first piston can act on the driven part of the second piston; when the first piston continues to move to the second position, the first piston drives the second piston to move to the fourth position.

2. The variable oil pressure brake structure of claim 1, wherein the first piston is movable relative to the second piston such that the second piston remains in the third position when the brake handle is operated to move the first piston from the first position to the second position by less than or equal to the predetermined distance.

3. The variable oil pressure brake structure as claimed in claim 1, wherein the first piston has a tail portion and a body portion, the outer diameter of the body portion is smaller than that of the tail portion, and the driving portion is located at an end surface of the tail portion adjacent to the body portion; the driven part of the second piston is positioned on one end surface of the second piston facing the driving part.

4. The variable hydraulic brake structure as claimed in claim 3, wherein the second piston is annular and is disposed around the body of the first piston, and the outer diameter of the second piston is larger than the outer diameter of the body.

5. The variable oil pressure brake structure according to claim 1, further comprising a first elastic member disposed in the movable space of the body, one end of the first elastic member abutting against the body, the other end of the first elastic member abutting against the first piston; and a second elastic piece is arranged in the movable space of the body, one end of the second elastic piece is propped against the body, and the other end of the second elastic piece is propped against the second piston.

6. The variable oil pressure brake structure according to claim 5, wherein the second elastic member has an outer diameter larger than that of the first elastic member, and the first elastic member extends into the second elastic member so that the second elastic member is fitted around the first elastic member.

7. The variable oil pressure brake structure as claimed in claim 5, wherein the first piston has a head portion extending into the first elastic member such that the first elastic member is fitted around the head portion.

8. The variable oil pressure brake structure of claim 1, wherein the brake lever has an adjusting member pivotally connected to one end of the body; the first piston is provided with a push rod, and one end of the push rod is abutted against the adjusting piece of the brake handle.

9. The variable hydraulic brake structure as claimed in claim 8, wherein the body further has a first adjusting screw disposed outside the first piston; when the first adjusting screw moves towards the direction close to or far away from the body, the push rod of the first piston can push the adjusting piece, so that the angle of the brake handle is changed.

10. The variable oil pressure brake structure according to claim 8, wherein the push rod is integrally formed with the first piston.

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