Oil pressure brake with adjustable stroke

Abstract

A stroke-adjustable oil pressure brake comprises a brake body, a piston rod, a handle and a transmission rod. The device further comprises a cylinder sleeve and an adjusting piece. The cylinder sleeve is movably arranged in the pressure cylinder, the cylinder sleeve at least has a first position state and a second position state relative to the pressure cylinder, and the movement of the cylinder sleeve can cause the piston rod to move relative to the pressure cylinder, so that the set initial position of the piston rod is changed; the adjusting part is movably connected to the brake body and comprises an operating end and an acting end, and the acting end of the adjusting part abuts against the cylinder sleeve; the adjusting piece acts on the cylinder sleeve to enable the cylinder sleeve to move, so that the transmission rod and the piston rod which are matched with the cylinder sleeve move along with the cylinder sleeve, the set initial position of the piston rod is changed, and the purpose of adjusting the idle stroke of the brake is achieved. Therefore, the matching relationship between the two is not changed.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic brake products, in particular to a hydraulic brake with adjustable stroke. Background Art

[0002] In vehicles such as bicycles, the device used to control the brakes is the brake (commonly known as the brake handle). The brake handle is a handle used for braking. The brake handle is used in bicycle brake handles, baby stroller handles, electric vehicle brake handles, motorcycle brake handles, etc.

[0003] With the continuous improvement of technology, the brakes used in bicycles and other vehicles on the market have gradually replaced the traditional brakes that relied on solid media such as steel wire for transmission, and replaced them with hydraulic brakes that use liquid media such as oil as transmission media. The most representative of these is the hydraulic brake.

[0004] The principle of hydraulic brakes is to connect one end of the brake oil pipe to the output end of the internal oil circuit of the brake handle base, and the other end of the brake oil pipe to the disc brake rotor. Pressing the handle can push the internal oil circuit piston rod, so that the pressure in the oil circuit acts on the disc brake rotor through the brake oil pipe, thus forming the disc brake operation.

[0005] In addition, in the structure of existing hydraulic brakes, transmission is achieved by relying on a transmission rod connected between the handle and the piston rod. When the transmission rod is driven toward the piston rod by the handle, the transmission rod will inevitably deflect relative to the piston rod. In order to prevent the mutual deflection between the two and generate stress, a ball socket is generally opened on the piston rod, and then one end of the transmission rod is set to a ball head shape, so that the two can deflect relative to each other at a certain angle while transmitting.

[0006] Among them, the Chinese patent application with patent number ZL202420599879.5 discloses: "A brake upper pump with forced power and low resistance, comprising: a brake pump body, an oil chamber is provided inside the brake pump body; a dynamic piston push rod, which is installed in the oil chamber; a brake handle, which is rotated together with the brake pump body through a pivot mechanism, and the brake handle is against the dynamic piston push rod through a rotating mechanism to form a transmission match; an oil pipe assembly, which is connected to the brake pump body and is in communication with the oil chamber; the oil chamber has a large diameter section and a small diameter section; the dynamic piston push rod includes an oil pushing section and a transmission section, the oil pushing section is located in the large diameter section, and the transmission section is at least partially arranged in the small diameter section; a large diameter piston oil seal is provided on the oil pushing section, and a small diameter piston oil seal is provided on the transmission section. The present invention obtains a larger oil pushing amount per unit moving distance of the piston push rod through the large diameter piston oil seal, thereby achieving a better braking effect; and reduces friction assistance through the small diameter piston oil seal, and has a lighter and better boosting feel."

[0007] In the prior art, when the handle of the hydraulic brake is not subjected to external force, the brake piston rod will be in a set starting position. When the operator presses the handle to drive the transmission rod and then push the piston rod, the piston rod will move to the pressurized position to send oil to the brake disc. There is a distance in the process of the piston rod moving from the set starting position to the pressurized position. During this distance, the piston rod does not apply pressure to send oil to the brake disc. Therefore, this distance is also called the idle stroke. Therefore, by changing the set starting position of the piston rod, the idle stroke of the brake can be increased or shortened.

[0008] With the continuous improvement of the structure of hydraulic brakes, as described in the above-mentioned patent, the piston rod of the brake in the prior art is no longer directly inserted into its pressure cylinder, but a cylinder sleeve is first installed in the pressure cylinder, and then the piston rod is inserted into the cylinder sleeve, and the transmission rod of the brake also needs to be inserted into the cylinder sleeve to form transmission with the piston rod. The method of adjusting the idle stroke in the original technology is to achieve it by directly pushing the piston rod. However, if this adjustment method is applied to a brake with a cylinder sleeve, certain problems will arise. For example, since a small part of the piston rod is located in the cylinder sleeve, if simply the starting position set by the piston rod changes, and the cylinder sleeve cannot move, then in this case the matching relationship between the piston rod and the transmission rod relative to the cylinder sleeve will change accordingly, which will have a certain negative impact on the normal operation of the brake. Therefore, the prior art lacks an idle stroke adjustment structure that can be applied to a hydraulic brake with a cylinder sleeve. Summary of the Invention

[0009] In order to overcome the deficiency in the prior art of lacking an idle stroke adjustment structure that can be applied to a hydraulic brake with a cylinder sleeve, the utility model provides a hydraulic brake with adjustable stroke.

[0010] The technical solution of the utility model to solve the technical problem is: a hydraulic brake with adjustable stroke, comprising:

[0011] The brake body has a pressure cylinder inside;

[0012] a piston rod movably disposed in the pressure cylinder, the piston rod having at least a selected starting position and a pressurizing position relative to the pressure cylinder;

[0013] a handle rotatably connected to the brake body;

[0014] a transmission rod, which is transmission-connected between the handle and the piston rod to convert the rotation of the handle into a horizontal push transmitted to the piston rod, thereby causing the piston rod to move between a selected starting position and a pressurized position;

[0015] Also included are:

[0016] a cylinder liner movably disposed within the pressure cylinder, the cylinder liner having at least a first position and a second position relative to the pressure cylinder, the cylinder liner further having a cylinder liner hole extending therethrough, the piston rod at least partially extending through the cylinder liner hole, and movement of the cylinder liner causing the piston rod to move relative to the pressure cylinder, thereby changing the set starting position of the piston rod;

[0017] An adjusting member is movably connected to the brake body, and includes an operating end and an action end. The action end of the adjusting member abuts against the cylinder sleeve, so that by operating the operating end of the adjusting member, the adjusting member can act on the cylinder sleeve to push the cylinder sleeve to move between the first position and the second position, thereby adjusting the selected starting position of the piston rod.

[0018] Furthermore, a first bolt hole is opened on one side of the brake body, and the adjusting member is arranged so that the first bolt passes through and is threadedly engaged in the first bolt hole; the head of the first bolt is exposed on the surface of the brake body as the operating end of the adjusting member; the rod of the first bolt is abutted on the rear end of the cylinder sleeve as the active end of the adjusting member.

[0019] Furthermore, the pressure cylinder includes a main section and a movable section. The movable section is arranged near the rear end opening of the pressure cylinder. A circle of limiting steps is also arranged between the main section and the movable section. A circle of limiting protrusions is also protruded on the rear end circumference of the cylinder sleeve. The limiting protrusions can translate in the movable section as the cylinder sleeve moves, and when the cylinder sleeve is in the first position, the limiting protrusions form an interference fit with the limiting steps.

[0020] Furthermore, a second bolt hole is provided on one side of the brake body, and a second bolt is passed through and threadedly engaged with the second bolt, the head of the second bolt is exposed on the surface of the brake body, and the rod of the second bolt extends into the pressure cylinder; a circle of limiting grooves is also provided on the surrounding side of the limiting protrusion, and the rod of the second bolt is inserted into the limiting groove, and when the cylinder sleeve is in the second position, the rod of the second bolt can form an interference fit with the front side wall of the limiting groove.

[0021] Furthermore, a receiving portion is provided on the rear end of the piston rod, and a pushing portion is provided on the front end of the transmission rod. The pushing portion and the receiving portion form an abutment to realize transmission between the transmission rod and the piston rod. The receiving portion is located in the cylinder liner hole, and the front end of the transmission rod extends into the cylinder liner hole through the rear end opening of the cylinder liner hole. A circle of anti-slip ribs is also protruded on the inner wall of the rear end opening of the cylinder liner hole. When the piston rod is located at the selected starting position, the two sides of the pushing portion are respectively pressed against the receiving portion and the anti-slip ribs.

[0022] Furthermore, the receiving portion of the piston rod is configured as a ball socket, and the pushing portion of the transmission rod is configured as a ball head. The ball head can be rotatably engaged in the ball socket, and the diameter of the ball head is larger than the inner diameter of the inner wall of the pressure cylinder at the anti-stripping rib, so that the ball head can abut the front side of the anti-stripping rib to form an interference fit.

[0023] Furthermore, a threaded portion is provided at the rear end of the transmission rod, and a connecting shaft is passed through the handle, and a third threaded hole is opened on the connecting shaft. The threaded portion of the transmission rod is passed through and threadedly engaged in the third threaded hole to realize the transmission connection between the transmission rod and the handle.

[0024] Furthermore, a return spring is provided in the pressure cylinder, and the return spring acts between the pressure cylinder and the piston rod, so that the piston rod always has a movement tendency to move toward a set starting position.

[0025] Furthermore, a first countersunk hole and a second countersunk hole are provided on the surface of the brake body; the first countersunk hole is connected to the first bolt hole, and when the rod of the first bolt is threadedly engaged in the first bolt hole, its head can be embedded in the first countersunk hole; the second countersunk hole is connected to the second bolt hole, and when the rod of the second bolt is threadedly engaged in the second bolt hole, its head can be embedded in the second countersunk hole.

[0026] Furthermore, a plurality of first sealing rings are embedded on the outer wall of the cylinder sleeve, and the first sealing rings are clamped between the pressure cylinder and the cylinder sleeve to form a sealing fit between the inner wall of the pressure cylinder and the outer wall of the cylinder sleeve; a second sealing ring is embedded on the outer wall of the piston rod near the rear end, and the second sealing ring is clamped between the piston rod and the cylinder sleeve to form a sealing fit between the inner wall of the cylinder sleeve and the outer wall of the piston rod.

[0027] The idle stroke adjustment method of the utility model:

[0028] When the idle stroke of the brake needs to be shortened: tighten the first bolt into the first bolt hole so that the rod of the first bolt moves forward, thereby causing the rod of the first bolt to push the cylinder sleeve forward, and the ball head that forms an anti-slip fit with the anti-slip rib of the cylinder sleeve will also be moved forward, and the ball head will then push the piston rod forward and deeper into the pressure cylinder, so that the set starting position of the piston rod moves into the pressure cylinder, thereby shortening the idle stroke of the brake;

[0029] When the idle stroke of the brake needs to be lengthened: loosen the first bolt toward the outside of the first bolt hole, so that the rod of the first bolt moves backward. Since the piston rod always has a tendency to move backward under the action of the return spring, the piston rod will move backward under the action of the return spring, and the ball head abutting the ball socket on the piston rod will also be pushed backward, and then the cylinder sleeve that forms an anti-slip fit with the ball head through the anti-slip rib will also move backward. At this time, since the piston rod moves backward and exits out of the pressure cylinder, the starting position set by the piston rod moves out of the pressure cylinder, thereby increasing the idle stroke of the brake.

[0030] The beneficial effects of the present invention are:

[0031] 1. The cylinder sleeve can move a certain distance in the pressure cylinder, and the brake body is also provided with an adjusting member that can drive the cylinder sleeve to move. The adjusting member acts on the cylinder sleeve to move it, thereby causing the transmission rod and piston rod that match the cylinder sleeve to move accordingly, thereby changing the set starting position of the piston rod, thereby achieving the purpose of adjusting the brake idle stroke. Moreover, since the cylinder sleeve and piston rod move together, the coordination relationship between the two will not change;

[0032] 2. The adjustment piece is installed on the brake body in the form of a first bolt. Therefore, when adjusting the idle travel of the brake, you can directly turn the first bolt from the brake surface, making the entire adjustment process simpler and faster.

[0033] 3. A second bolt is also provided on the brake body to limit the range of movement of the cylinder sleeve to ensure that the cylinder sleeve does not move excessively during adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural diagram of embodiment 1 of the present utility model.

[0035] Figure 2 It is an explosion diagram of the first embodiment of the present invention.

[0036] Figure 3 It is a cross-sectional view of embodiment 1 of the present utility model.

[0037] Figure 4 yes Figure 3 Enlarged schematic diagram of point A in the middle.

[0038] Figure 5 It is a schematic diagram of the coordination of the transmission rod, cylinder sleeve and adjustment member in the first embodiment of the present invention.

[0039] Figure 6 It is a structural schematic diagram of the brake body in the first embodiment of the present invention.

[0040] Figure 7 This is a schematic diagram of the coordination of the handle and the transmission rod in the first embodiment of the present invention.

[0041] Figure 8 This is a schematic diagram of the state change of the brake in the second embodiment of the present utility model.

[0042] Reference numerals in the figure: 1, brake body; 11, pressure cylinder; 111, main section; 112, moving section; 113, limiting step; 12, first bolt hole; 13, second bolt hole; 14, first countersunk hole; 15, second countersunk hole;

[0043] 2. Piston rod; 21. Socket; 21a. Ball socket; 22. Second sealing ring;

[0044] 3. Handle; 31. Connecting shaft; 311. Third threaded hole;

[0045] 4. Transmission rod; 41. Pushing portion; 41a. Ball head; 42. Threaded portion;

[0046] 5. Cylinder liner; 51. Cylinder liner hole; 52. Anti-stripping rib; 53. Limiting protrusion; 531. Limiting groove; 54. First sealing ring;

[0047] 6. Adjusting member; 6a. First bolt; 61. Operating end; 62. Active end;

[0048] 7. Second bolt;

[0049] 8. Return spring;

[0050] x, first position; y, second position. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] It should be understood that although terms such as upper, middle, lower, top, end, etc. appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for ease of understanding, and are not used to define any direction or order limitation.

[0053] Example 1

[0054] Combine Figures 1 to 7The hydraulic brake with adjustable stroke shown in the figure includes a brake body 1, a piston rod 2, a handle 3 and a transmission rod 4; a pressure cylinder 11 is provided inside the brake body 1; the piston rod 2 is movably arranged in the pressure cylinder 11, and the piston rod 2 has at least a selected starting position and a pressurized position relative to the pressure cylinder 11; the handle 3 is rotatably connected to the brake body 1; the transmission rod 4 is transmission-connected between the handle 3 and the piston rod 2 to realize the conversion of the rotation of the handle 3 into a horizontal push transmitted to the piston rod 2, thereby moving the piston rod 2 between the selected starting position and the pressurized position; and further includes a cylinder sleeve 5 and an adjusting member 6; the cylinder sleeve 5 is movably arranged in the pressure cylinder 11, and the cylinder sleeve 5 Relative to the pressure cylinder 11, it has at least a first position x and a second position y. The cylinder sleeve 5 is also provided with a cylinder sleeve hole 51 that penetrates inside and outside. The piston rod 2 is at least partially inserted into the cylinder sleeve hole 51, and the movement of the cylinder sleeve 5 can cause the piston rod 2 to move relative to the pressure cylinder 11, so that the set starting position of the piston rod 2 changes; the adjusting member 6 is movably connected to the brake body 1, and the adjusting member 6 includes an operating end 61 and an action end 62. The action end 62 of the adjusting member 6 is abutted against the cylinder sleeve 5, so that by operating the operating end 61 of the adjusting member 6, the adjusting member 6 can act on the cylinder sleeve 5 to push the cylinder sleeve 5 to move between the first position x and the second position y, thereby adjusting the selected starting position of the piston rod 2.

[0055] Combine Figures 2 to 5 As shown, in this embodiment, a first bolt hole 12 is opened on one side of the brake body 1, and the adjusting member 6 is configured as a first bolt 6a passing through and threadedly fitted into the first bolt hole 12; the head of the first bolt 6a serves as the operating end 61 of the adjusting member 6 and is exposed on the surface of the brake body 1; the rod of the first bolt 6a serves as the active end 62 of the adjusting member 6 and abuts against the rear end of the cylinder sleeve 5.

[0056] Combine Figure 3 and Figure 4 As shown, the pressure cylinder 11 described in this embodiment includes a main section 111 and a movable section 112. The movable section 112 is arranged near the rear end opening of the pressure cylinder 11. A circle of limiting steps 113 is also arranged between the main section 111 and the movable section 112. A circle of limiting protrusions 53 are also protruded on the rear end circumference of the cylinder sleeve 5. The limiting protrusions 53 can translate in the movable section 112 as the cylinder sleeve 5 moves, and when the cylinder sleeve 5 is in the first position x, the limiting protrusions 53 form an interference fit with the limiting steps 113.

[0057] Combine Figures 2 to 4As shown, a second bolt hole 13 is further provided on one side of the brake body 1 described in this embodiment, and a second bolt 7 is penetrated and threadedly engaged in the second bolt hole 13, the head of the second bolt 7 is exposed on the surface of the brake body 1, and the rod of the second bolt 7 extends into the pressure cylinder 11; a circle of limiting grooves 531 are also provided on the surrounding side of the limiting protrusion 53, and the rod of the second bolt 7 is inserted into the limiting groove 531, and when the cylinder sleeve 5 is in the second position y, the rod of the second bolt 7 can form an interference fit with the front side wall of the limiting groove 531.

[0058] Combine Figures 2 to 5 As shown, in this embodiment, a receiving portion 21 is provided on the rear end of the piston rod 2, and a pushing portion 41 is provided on the front end of the transmission rod 4. The pushing portion 41 forms an abutment with the receiving portion 21 to realize the transmission between the transmission rod 4 and the piston rod 2. The receiving portion 21 is located in the cylinder sleeve hole 51, and the front end of the transmission rod 4 extends into the cylinder sleeve hole 51 through the rear end opening of the cylinder sleeve hole 51. A circle of anti-slip ribs 52 are also protruding on the inner wall of the rear end opening of the cylinder sleeve hole 51. When the piston rod 2 is located at the selected starting position, the two sides of the pushing portion 41 are respectively pressed against the receiving portion 21 and the anti-slip ribs 52.

[0059] Combine Figures 2 to 5 As shown, in this embodiment, the receiving portion 21 of the piston rod 2 is configured as a ball socket 21a, and the pushing portion 41 of the transmission rod 4 is configured as a ball head 41a. The ball head 41a is rotatably engaged in the ball socket 21a, and the diameter of the ball head 41a is larger than the inner diameter of the inner wall of the pressure cylinder 11 at the anti-slip rib 52, so that the ball head 41a can abut the front side of the anti-slip rib 52 to form an interference fit.

[0060] Among them Figure 7 As shown in the figure, in this embodiment, the rear end of the transmission rod 4 is provided with a threaded portion 42, and the handle 3 is further provided with a connecting shaft 31, and the connecting shaft 31 is provided with a third threaded hole 311. The threaded portion 42 of the transmission rod 4 is passed through and threadedly engaged in the third threaded hole 311 to realize the transmission connection between the transmission rod 4 and the handle 3.

[0061] Combine Figure 2 and Figure 3 As shown, in this embodiment, a return spring 8 is further provided in the pressure cylinder 11. The return spring 8 acts between the pressure cylinder 11 and the piston rod 2 so that the piston rod 2 always has a movement tendency to move toward a set starting position.

[0062] Among them Figure 6As shown in the figure, in this embodiment, the surface of the brake body 1 is further provided with a first countersunk hole 14 and a second countersunk hole 15; the first countersunk hole 14 is connected to the first bolt hole 12, and when the rod of the first bolt 6a is threadedly engaged in the first bolt hole 12, its head can be embedded in the first countersunk hole 14; the second countersunk hole 15 is connected to the second bolt hole 13, and when the rod of the second bolt 7 is threadedly engaged in the second bolt hole 13, its head can be embedded in the second countersunk hole 15.

[0063] Combine Figure 2 and Figure 3 As shown, in this embodiment, several first sealing rings 54 are embedded on the outer wall of the cylinder sleeve 5, and the first sealing rings 54 are clamped between the pressure cylinder 11 and the cylinder sleeve 5, so that a sealing fit is formed between the inner wall of the pressure cylinder 11 and the outer wall of the cylinder sleeve 5; a second sealing ring 22 is embedded on the outer wall of the piston rod 2 near the rear end, and the second sealing ring 22 is clamped between the piston rod 2 and the cylinder sleeve 5, so that a sealing fit is formed between the inner wall of the cylinder sleeve 5 and the outer wall of the piston rod 2.

[0064] The idle stroke adjustment method of this embodiment is as follows:

[0065] When the idle stroke of the brake needs to be shortened: the first bolt 6a is tightened into the first bolt hole 12, so that the rod of the first bolt 6a moves forward, thereby causing the rod of the first bolt 6a to push the cylinder sleeve 5 forward, and the ball head 41a, which forms an anti-slip fit with the anti-slip rib 52 of the cylinder sleeve 5, is also moved forward. The ball head 41a then pushes the piston rod 2 forward and deeper into the pressure cylinder 11, so that the set starting position of the piston rod 2 moves into the pressure cylinder 11, thereby shortening the idle stroke of the brake;

[0066] When the idle stroke of the brake needs to be lengthened: loosen the first bolt 6a toward the outside of the first bolt hole 12, so that the rod of the first bolt 6a moves backward. Since the piston rod 2 always has a tendency to move backward under the action of the return spring 8, the piston rod 2 will move backward under the action of the return spring 8, and the ball head 41a that abuts the ball socket 21a on the piston rod 2 will also be pushed to move backward, and then the cylinder sleeve 5 that forms an anti-slip fit with the ball head 41a through the anti-slip rib 52 will also move backward. At this time, since the piston rod 2 moves backward and exits out of the pressure cylinder 11, the starting position set by the piston rod 2 moves out of the pressure cylinder 11, thereby increasing the idle stroke of the brake.

[0067] The advantage of this embodiment is that, by relying on the setting of the adjusting member and the movable setting of the cylinder sleeve, the idle stroke of the hydraulic brake with the cylinder sleeve can be adjusted, and after the stroke adjustment is completed, the matching relationship among the cylinder sleeve, the piston rod and the transmission rod will not change, thereby ensuring the normal operation of the hydraulic brake.

[0068] Example 2

[0069] Reference Figure 8 As shown, this embodiment provides the position distribution and matching relationship between the components when the brake in the above embodiment 1 is in the two extreme states of the idle stroke.

[0070] Reference Figure 8 As shown, in this embodiment, the cylinder sleeve 5 of the brake has at least a first position x and a second position y;

[0071] The process of the cylinder sleeve 5 switching to the first position x is as follows: the first bolt 6a is fully tightened into the first bolt hole 12, so that the rod of the first bolt 6a pushes the cylinder sleeve 5 forward until the limiting protrusion 53 thereon forms an interference fit with the limiting step 113 in the pressure cylinder 11. At this time, the cylinder sleeve 5 has moved to the first position x and can no longer move forward. During this process, the ball head 41a on the transmission rod 4 also moves forward under the drive of the cylinder sleeve 5, and then the ball head 41a can push the piston rod 2 forward, so that the set starting position of the piston rod 2 moves forward. Therefore, the idle travel of the brake is the shortest at this time.

[0072] The process of the cylinder sleeve 5 switching to the second position y: the rod portion of the first bolt 6a is unscrewed from the first bolt hole 12. Since the return spring 8 acts on the piston rod 2, and the piston rod 2 acts on the ball head 41a, the ball head 41a then acts on the cylinder sleeve 5, so that the piston rod 2, the ball head 41a and the cylinder sleeve 5 retreat together, until the rod portion of the second bolt 7 forms an interference fit with the front side groove wall of the upper limit groove 531 of the cylinder sleeve 5. At this time, the cylinder sleeve 5 has moved to the second position y and can no longer move backward. In this process, the piston rod 2 also completes the backward movement, so that the starting position set by the piston rod 2 moves backward. Therefore, the idle stroke of the brake is the longest at this time.

[0073] The remaining structures, methods and advantages of this embodiment are consistent with those of the above-mentioned embodiment 1 and will not be repeated here.

[0074] The above specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the embodiments as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A hydraulic brake with adjustable stroke, comprising: A brake body (1) is provided with a pressure cylinder (11) therein; A piston rod (2) is movably disposed in the pressure cylinder (11), wherein the piston rod (2) has at least a selected starting position and a pressurizing position relative to the pressure cylinder (11); A handle (3) rotatably connected to the brake body (1); A transmission rod (4) is connected between the handle (3) and the piston rod (2) to convert the rotation of the handle (3) into a horizontal push and transmit it to the piston rod (2), thereby causing the piston rod (2) to move between a selected starting position and a pressurized position; It is characterized in that Also included are: A cylinder sleeve (5) is movably arranged in a pressure cylinder (11), wherein the cylinder sleeve (5) has at least a first position (x) and a second position (y) relative to the pressure cylinder (11), and a cylinder sleeve hole (51) is also provided on the cylinder sleeve (5) so as to penetrate inside and outside the cylinder sleeve, wherein the piston rod (2) is at least partially passed through the cylinder sleeve hole (51), and movement of the cylinder sleeve (5) can cause the piston rod (2) to move relative to the pressure cylinder (11), so that the set starting position of the piston rod (2) is changed; An adjusting member (6) is movably connected to the brake body (1), and the adjusting member (6) includes an operating end (61) and an action end (62). The action end (62) of the adjusting member (6) abuts against the cylinder sleeve (5), so that by operating the operating end (61) of the adjusting member (6), the adjusting member (6) can act on the cylinder sleeve (5) to push the cylinder sleeve (5) to move between a first position (x) and a second position (y), thereby adjusting the selected starting position of the piston rod (2).

2. The stroke-adjustable hydraulic brake according to claim 1, characterized in that: A first bolt hole (12) is provided on one side of the brake body (1), and the adjusting member (6) is provided with a first bolt (6a) passing through and threadedly fitting into the first bolt hole (12); the head of the first bolt (6a) serves as the operating end (61) of the adjusting member (6) and is exposed on the surface of the brake body (1); the rod of the first bolt (6a) serves as the active end (62) of the adjusting member (6) and abuts against the rear end of the cylinder sleeve (5).

3. The stroke-adjustable hydraulic brake according to claim 2, characterized in that: The pressure cylinder (11) includes a main section (111) and a movable section (112). The movable section (112) is arranged near the rear end opening of the pressure cylinder (11). A circle of limiting steps (113) is also arranged between the main section (111) and the movable section (112). A circle of limiting protrusions (53) is also protruded on the rear end peripheral side of the cylinder sleeve (5). The limiting protrusions (53) can translate in the movable section (112) as the cylinder sleeve (5) moves, and when the cylinder sleeve (5) is in the first position (x), the limiting protrusions (53) and the limiting steps (113) form an interference fit.

4. The stroke-adjustable hydraulic brake according to claim 3, characterized in that: A second bolt hole (13) is also provided on one side of the brake body (1), and a second bolt (7) is passed through and threadedly engaged in the second bolt hole (13). The head of the second bolt (7) is exposed on the surface of the brake body (1), and the rod of the second bolt (7) extends into the pressure cylinder (11); a circle of limiting grooves (531) is also provided on the circumference of the limiting protrusion (53), and the rod of the second bolt (7) is inserted into the limiting groove (531), and when the cylinder sleeve (5) is in the second position (y), the rod of the second bolt (7) can form an interference fit with the front side wall of the limiting groove (531).

5. The stroke-adjustable hydraulic brake according to claim 1, characterized in that: A receiving portion (21) is provided on the rear end of the piston rod (2), and a pushing portion (41) is provided on the front end of the transmission rod (4). The pushing portion (41) and the receiving portion (21) form abutment to realize transmission between the transmission rod (4) and the piston rod (2). The receiving portion (21) is located in the cylinder sleeve hole (51), and the front end of the transmission rod (4) extends into the cylinder sleeve hole (51) through the rear end opening of the cylinder sleeve hole (51). A circle of anti-slip ribs (52) are also protruded on the inner wall of the rear end opening of the cylinder sleeve hole (51). When the piston rod (2) is located at the selected starting position, the two sides of the pushing portion (41) are respectively pressed against the receiving portion (21) and the anti-slip ribs (52).

6. The stroke-adjustable hydraulic brake according to claim 5, characterized in that: The receiving portion (21) of the piston rod (2) is configured as a ball socket (21a), and the pushing portion (41) of the transmission rod (4) is configured as a ball head (41a). The ball head (41a) is rotatably engaged in the ball socket (21a), and the diameter of the ball head (41a) is larger than the inner diameter of the inner wall of the pressure cylinder (11) at the anti-slip rib (52), so that the ball head (41a) can abut against the front side of the anti-slip rib (52) to form an interference fit.

7. The stroke-adjustable hydraulic brake according to claim 1, characterized in that: The rear end of the transmission rod (4) is provided with a threaded portion (42), and the handle (3) is further provided with a connecting shaft (31), and the connecting shaft (31) is provided with a third threaded hole (311). The threaded portion (42) of the transmission rod (4) is provided and threadedly engaged in the third threaded hole (311) to achieve a transmission connection between the transmission rod (4) and the handle (3).

8. The stroke-adjustable hydraulic brake according to claim 1, characterized in that: A return spring (8) is also provided in the pressure cylinder (11), and the return spring (8) acts between the pressure cylinder (11) and the piston rod (2), so that the piston rod (2) always has a movement tendency to move toward a set starting position.

9. The stroke-adjustable hydraulic brake according to claim 4, characterized in that: The surface of the brake body (1) is further provided with a first countersunk hole (14) and a second countersunk hole (15); the first countersunk hole (14) is connected to the first bolt hole (12), and when the rod of the first bolt (6a) is threadedly engaged in the first bolt hole (12), its head can be embedded in the first countersunk hole (14); the second countersunk hole (15) is connected to the second bolt hole (13), and when the rod of the second bolt (7) is threadedly engaged in the second bolt hole (13), its head can be embedded in the second countersunk hole (15).

10. The stroke-adjustable hydraulic brake according to claim 1, characterized in that: A plurality of first sealing rings (54) are embedded on the outer wall of the cylinder sleeve (5), and the first sealing rings (54) are sandwiched between the pressure cylinder (11) and the cylinder sleeve (5) so that a sealing fit is formed between the inner wall of the pressure cylinder (11) and the outer wall of the cylinder sleeve (5); a second sealing ring (22) is embedded on the outer wall of the piston rod (2) near the rear end, and the second sealing ring (22) is sandwiched between the piston rod (2) and the cylinder sleeve (5) so that a sealing fit is formed between the inner wall of the cylinder sleeve (5) and the outer wall of the piston rod (2).

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