Brake master cylinder

Abstract

The utility model discloses a brake master cylinder which aims at solving the problem that in the prior art, oil supplementing efficiency in a brake master cylinder is low. According to the technical scheme, the hydraulic cylinder comprises a cylinder body, a first piston assembly and a second piston assembly are arranged in the cylinder body, center valves are arranged in the first piston assembly and the second piston assembly respectively, and each center valve comprises a valve hole, a first valve element and a pushing assembly pushing the first valve element to be matched with the valve hole. A plurality of spiral grooves are formed in the inner side wall of the valve hole, and a plurality of spiral strips matched with the spiral grooves are arranged on the outer side wall of the first valve element. The oil supplementing space of the valve hole is increased through the spiral groove, and therefore the oil supplementing efficiency of the valve hole can be improved. And through cooperation of the spiral strip and the spiral groove, when the valve element and the valve hole are matched, the sealing performance between the spiral strip and the spiral groove is improved, and the sealing effect in the working state can be better improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile braking, and more specifically, to a brake master cylinder. Background Art

[0002] The hydraulic brake master cylinder uses brake fluid as the working medium, and uses the incompressibility of the liquid to generate a braking driving force to move the brake components to achieve the purpose of vehicle braking. Generally, the brake master cylinder is divided into two types: the center valve structure and the non-center valve structure. The master cylinder with the center valve structure needs to use the center valve limit pin to push open the center valve so that it remains in a normally open state when not in operation.

[0003] With the development and application of ABS in automobile safety braking systems, the central valve structure in the existing technology, the compensation hole structure used in the traditional brake master cylinder cannot meet the requirements of rapid oil replenishment, high-frequency vibration of hydraulic pressure and absolute leakage-free during the braking pressure maintenance process of the ABS system, which affects the braking effect of the car and brings great hidden dangers to driving safety.

[0004] The Chinese patent announcement number is CN200939879Y, and the announcement date is August 29, 2007. The name of the invention is a brake master cylinder assembly for automobiles. The application discloses a brake master cylinder structure. It includes a cylinder body, a front piston assembly, a rear piston assembly and an oil cup assembly. The front piston assembly and the rear piston assembly are arranged in the cylinder body. The oil cup assembly is connected to the cylinder body through the oil inlet on the cylinder body. The rear piston assembly includes a rear piston and a limit screw. The rear piston and the limit screw are connected by riveting. In the above patent document, in the above center valve assembly, the valve core and the valve hole are matched to realize the opening and closing of the center valve. However, when the above structure is used, when it is necessary to compensate the hydraulic oil, the gap between the valve core and the valve hole is small when replenishing the oil due to the structure of the cylinder and the round hole, which makes the efficiency of replenishing the oil low. Utility Model Content

[0005] The utility model overcomes the shortcoming of low efficiency of oil replenishment in the brake master cylinder in the prior art, and provides a brake master cylinder, which has a large gap for oil replenishment during oil replenishment, so that oil replenishment can be made in time, the efficiency of oil replenishment is improved, and the sealing effect is good when closed, and a good sealing effect can be maintained even when the oil pressure is high.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: a brake master cylinder, comprising: a cylinder body, a first piston assembly and a second piston assembly are arranged in the cylinder body, a central valve is arranged in the first piston assembly and the second piston assembly, the central valve comprises a valve hole, a first valve core and a pushing component for pushing the first valve core to cooperate with the valve hole, the inner side wall of the valve hole is provided with a plurality of spiral grooves, and the outer side wall of the first valve core is provided with a plurality of spiral strips cooperating with the spiral grooves.

[0007] In the utility model, by providing a spiral groove on the inner wall of the valve hole and a spiral strip on the outer wall of the valve core, the spiral groove can be used to increase the oil replenishment space of the valve hole, so that the valve hole can improve the efficiency of oil replenishment. And through the cooperation of the spiral strip and the spiral groove, when the valve core and the valve hole are in cooperation, the sealing performance between the spiral strip and the spiral groove is improved, so that the sealing effect in the working state can be better improved.

[0008] Preferably, the pushing assembly includes a pushing spring and a pushing rod fixedly arranged at one end of the first valve core, a pushing disk is arranged in the circumferential direction of the pushing rod, and the pushing spring and the pushing disk are in abutment with each other.

[0009] An abutment ring is arranged at the end of the second through hole away from the valve hole, and two ends of the push spring are respectively abutted between the abutment ring and the push disk.

[0010] Preferably, a pushing hole is provided on the pushing plate, a pushing bearing is provided in the pushing hole, and the pushing rod is fixedly provided in the pushing bearing.

[0011] The setting of the push bearing allows the push plate and the push rod to be fixed in the axial direction, while in the radial circumferential direction, the push plate and the push rod can rotate freely. When the spiral strip on the valve core and the spiral groove in the valve hole cooperate, the valve core can rotate smoothly, so that the valve core and the valve hole can cooperate more smoothly.

[0012] Preferably, a second valve core is fixedly provided on the push rod at the end, and the diameter of the second valve core is larger than the diameter of the valve hole; the second valve core is arranged between the push disk and the first valve core.

[0013] By setting a second sealing property for auxiliary sealing, when in working state, the thrust spring pushes the valve core and the valve hole to fully cooperate, and the second valve core abuts against the end of the valve hole, and the second valve core blocks the valve hole, thereby achieving a secondary sealing effect on the valve hole.

[0014] Preferably, the second piston assembly includes a second piston and a first convex ring and a second convex ring arranged on the periphery of the second piston, the first convex ring and the second convex ring cooperate to form a first ring groove, and a first sealing ring is arranged in the first ring groove.

[0015] The first sealing ring cooperates with the inside of the piston cavity, so that the second piston can closely cooperate with the inner wall of the piston cavity to form a sealed cavity.

[0016] Preferably, the valve hole is arranged along the axis of the second piston, and a first through hole and a second through hole are respectively arranged at both ends of the valve hole in the axial direction, and the diameters of the first through hole, the valve hole and the second through hole gradually increase in sequence.

[0017] The diameters of the first through hole, the valve hole and the second through hole are gradually increased in sequence, so that the first through hole, the valve hole and the second through hole form a stepped hole.

[0018] Preferably, a center rod is provided at the end of the first valve core away from the push spring; and a cylindrical pin is provided along the radial direction of the cylinder body.

[0019] The center rod is inserted into the first through hole. When in a non-working state, the end of the center rod abuts against the cylindrical pin, so that the center rod is pushed to move in a direction away from the first through hole, so that the valve core is separated from the valve hole, and the center valve is in an open state, so that the hydraulic oil can be replenished from the valve hole to the oil chamber formed by the first piston and the piston chamber.

[0020] Preferably, a plurality of sealing convex rings are coaxially arranged at the end of the second valve core close to the valve hole.

[0021] By setting a sealing convex ring at the end of the second valve core, the sealing effect of the second valve core and the end of the valve hole can be improved. Compared with the prior art, the beneficial effect of the utility model is as follows: the utility model sets a spiral groove on the inner wall of the valve hole and a spiral strip on the outer wall of the valve core, and can use the spiral groove to increase the oil replenishment space of the valve hole, so that the valve hole can improve the efficiency of oil replenishment. And through the cooperation of the spiral strip and the spiral groove, the valve core and the valve hole are equivalent to "unscrewing the bottle cap" when they are matched, thereby improving the sealing performance between the spiral strip and the spiral groove, so that the sealing effect in the working state can be better improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the utility model.

[0023] Figure 2 yes Figure 1 A partial enlarged view of the .

[0024] In the figure: 1, cylinder body, 11, piston chamber, 12, cylindrical pin, 13, oil pump assembly;

[0025] 2. Second piston assembly, 21. Second piston, 211. First convex ring, 212. Second convex ring, 213. First ring groove, 214. First sealing ring, 215. Valve hole, 216. First through hole, 217. Second through hole, 218. Spiral groove, 22. Second return spring;

[0026] 3. first piston assembly, 31. first piston, 32. first return spring;

[0027] 4. Cylinder push rod;

[0028] 5. Center valve, 51. First valve core, 511. Spiral strip, 52. Push rod, 53. Push disk, 54. Center rod, 55. Second valve core, 56. Push spring. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0030] Example 1: Reference Figure 1 and Figure 2 As shown, a brake master cylinder includes: a cylinder body 1, an oil cup assembly 13 arranged on the outer wall of the cylinder body 1, the oil cup assembly and the interior of the cylinder body 1 are connected, a piston chamber 11 is arranged inside the cylinder body 1, a first piston assembly 3 and a second piston assembly 2 are arranged in the piston chamber 11, the first piston assembly 3 is arranged inside the opening of the piston chamber 11, and the second piston assembly 2 is arranged inside the opening away from the piston chamber 11.

[0031] The first piston assembly 3 and the second piston assembly 2 have similar structures. The second piston assembly 2 includes a second piston 21 and a second return spring 22, and the first piston assembly 3 includes a first piston 31 and a first return spring 32. The second return spring 22 abuts against the second piston 21 and the end of the piston chamber 11, and the second spring abuts between the first piston 31 and the second piston 21. A cylinder push rod 4 is provided at the end of the first piston 31 away from the second piston 21, and a center valve 5 is provided in both the first piston 31 and the second piston 21, and the structures of the two center valves 5 are the same.

[0032] Taking the second piston 21 as an example, the second piston assembly 2 includes the second piston 21 and a first convex ring 211 and a second convex ring 212 disposed on the periphery of the second piston 21. The first convex ring 211 and the second convex ring 212 cooperate to form a first ring groove 213. A first sealing ring 214 is disposed in the first ring groove 213. The second spring abuts between the second convex ring 212 and the end of the piston chamber 11.

[0033] A valve hole 215 is provided at the axial position of the second piston 21. A first through hole 216 and a second through hole 217 are provided at both ends of the valve hole 215 in the axial direction, respectively. The diameters of the first through hole 216, the valve hole 215 and the second through hole 217 gradually increase in sequence, so that the first through hole 216, the valve hole 215 and the second through hole 217 form a stepped hole. The first through hole 216 is provided at one end close to the opening of the piston chamber 11, and the second through hole 217 is provided at one end away from the opening of the piston chamber 11.

[0034] The central valve 5 in the second piston 21 includes a valve hole 215, a first valve core 51, and a pushing assembly for pushing the first valve core 51 to cooperate with the valve hole 215. The inner wall of the valve hole 215 is provided with a plurality of spiral grooves 218, and the outer wall of the first valve core 51 is provided with a plurality of spiral strips 511 that cooperate with the spiral grooves 218. In this embodiment, four spiral grooves 218 are provided, and the four spiral grooves 218 are evenly distributed in the circumferential direction of the valve hole 215. Correspondingly, four spiral strips 511 are also provided, and the four spiral strips 511 are evenly distributed in the circumferential direction of the first valve core 51, that is, the angle between each adjacent spiral groove 218 or adjacent spiral strips 511 is ninety degrees.

[0035] In this embodiment, the spiral groove 218 is provided in the axial direction of the inner side wall of the valve hole 215, that is, the axial length of the valve hole 215 is L1, and the length of the spiral groove 218 along the axial direction is also L1. On the first valve core 51, only the end position away from the first valve hole 215 is provided with a spiral strip 511 with a length equivalent to one quarter of the axial length of the first valve core 51, that is, the length of the first valve core 51 is L2, and the axial length of the spiral strip 511 is L2 / 4.

[0036] By providing the spiral groove 218 and the spiral strip 511 for cooperation, the spiral groove 218 can be used to increase the oil replenishment space of the valve hole 215, so that the valve hole 215 can improve the efficiency of oil replenishment. And through the cooperation of the spiral strip 511 and the spiral groove 218, the valve core and the valve hole 215 are equivalent to "unscrewing the bottle cap" when they are in cooperation, thereby improving the sealing performance between the spiral strip 511 and the spiral groove 218, so that the sealing effect in the working state can be better improved.

[0037] The push assembly includes a push spring 56 and a push rod 52 fixedly arranged at one end of the first valve core 51. A push disk 53 is arranged in the circumferential direction of the push rod 52, and the push spring 56 and the push disk 53 are in contact with each other. An abutment ring is arranged at the end of the second through hole 217 away from the valve hole 215, and the two ends of the push spring 56 are respectively in contact between the abutment ring and the push disk 53.

[0038] A center rod 54 is fixedly provided at the end of the first valve core 51 near the first through hole 216; a cylindrical pin 12 is provided along the radial direction of the cylinder body 1. The center rod 54 is inserted into the first through hole 216. When in a non-working state, the end of the center rod 54 abuts against the cylindrical pin 12, so that the center rod 54 is pushed to move in a direction away from the first through hole 216, so that the valve core is disengaged from the valve hole 215, so that the center valve 5 is in an open state, so that the hydraulic oil can be replenished from the valve hole 215 to the oil chamber formed by the first piston 31 and the piston chamber 11.

[0039] In the present invention, by providing a spiral groove 218 on the inner wall of the valve hole 215 and a spiral strip 511 on the outer wall of the valve core, the spiral groove 218 can be used to increase the oil replenishment space of the valve hole 215, so that the valve hole 215 can improve the efficiency of oil replenishment. And through the cooperation of the spiral strip 511 and the spiral groove 218, the valve core and the valve hole 215 are equivalent to "unscrewing the bottle cap" when they are in cooperation, thereby improving the sealing performance between the spiral strip 511 and the spiral groove 218, so that the sealing effect in the working state can be better improved.

[0040] Example 2: Reference Figure 1 and Figure 2 As shown, a brake master cylinder includes: a cylinder body 1, an oil cup assembly 13 arranged on the outer wall of the cylinder body 1, the oil cup assembly and the interior of the cylinder body 1 are connected, a piston chamber 11 is arranged inside the cylinder body 1, a first piston assembly 3 and a second piston assembly 2 are arranged in the piston chamber 11, the first piston assembly 3 is arranged inside the opening of the piston chamber 11, and the second piston assembly 2 is arranged inside the opening away from the piston chamber 11.

[0041] The first piston assembly 3 and the second piston assembly 2 have similar structures. The second piston assembly 2 includes a second piston 21 and a second return spring 22, and the first piston assembly 3 includes a first piston 31 and a first return spring 32. The second return spring 22 abuts against the second piston 21 and the end of the piston chamber 11, and the second spring abuts between the first piston 31 and the second piston 21. A cylinder push rod 4 is provided at the end of the first piston 31 away from the second piston 21, and a center valve 5 is provided in both the first piston 31 and the second piston 21, and the structures of the two center valves 5 are the same.

[0042] Taking the second piston 21 as an example, the second piston assembly 2 includes the second piston 21 and a first convex ring 211 and a second convex ring 212 disposed on the periphery of the second piston 21. The first convex ring 211 and the second convex ring 212 cooperate to form a first ring groove 213. A first sealing ring 214 is disposed in the first ring groove 213. The second spring abuts between the second convex ring 212 and the end of the piston chamber 11.

[0043] A valve hole 215 is provided at the axial position of the second piston 21. A first through hole 216 and a second through hole 217 are provided at both ends of the valve hole 215 in the axial direction, respectively. The diameters of the first through hole 216, the valve hole 215 and the second through hole 217 gradually increase in sequence, so that the first through hole 216, the valve hole 215 and the second through hole 217 form a stepped hole. The first through hole 216 is provided at one end close to the opening of the piston chamber 11, and the second through hole 217 is provided at one end away from the opening of the piston chamber 11.

[0044] The central valve 5 in the second piston 21 includes a valve hole 215, a first valve core 51, and a pushing assembly for pushing the first valve core 51 to cooperate with the valve hole 215. The inner wall of the valve hole 215 is provided with a plurality of spiral grooves 218, and the outer wall of the first valve core 51 is provided with a plurality of spiral strips 511 that cooperate with the spiral grooves 218. In this embodiment, four spiral grooves 218 are provided, and the four spiral grooves 218 are evenly distributed in the circumferential direction of the valve hole 215. Correspondingly, four spiral strips 511 are also provided, and the four spiral strips 511 are evenly distributed in the circumferential direction of the first valve core 51, that is, the angle between each adjacent spiral groove 218 or adjacent spiral strips 511 is ninety degrees.

[0045] In this embodiment, the spiral groove 218 is provided in the axial direction of the inner side wall of the valve hole 215, that is, the axial length of the valve hole 215 is L1, and the length of the spiral groove 218 along the axial direction is also L1. On the first valve core 51, only the end position away from the first valve hole 215 is provided with a spiral strip 511 with a length equivalent to one quarter of the axial length of the first valve core 51, that is, the length of the first valve core 51 is L2, and the axial length of the spiral strip 511 is L2 / 4.

[0046] By providing the spiral groove 218 and the spiral strip 511 for cooperation, the spiral groove 218 can be used to increase the oil replenishment space of the valve hole 215, so that the valve hole 215 can improve the efficiency of oil replenishment. And through the cooperation of the spiral strip 511 and the spiral groove 218, the valve core and the valve hole 215 are equivalent to "unscrewing the bottle cap" when they are in cooperation, thereby improving the sealing performance between the spiral strip 511 and the spiral groove 218, so that the sealing effect in the working state can be better improved.

[0047] The push assembly includes a push spring 56 and a push rod 52 fixedly arranged at one end of the first valve core 51. A push disk 53 is arranged in the circumferential direction of the push rod 52, and the push spring 56 and the push disk 53 are in contact with each other. An abutment ring is arranged at the end of the second through hole 217 away from the valve hole 215, and the two ends of the push spring 56 are respectively in contact between the abutment ring and the push disk 53.

[0048] A center rod 54 is fixedly provided at the end of the first valve core 51 near the first through hole 216; a cylindrical pin 12 is provided along the radial direction of the cylinder body 1. The center rod 54 is inserted into the first through hole 216. When in a non-working state, the end of the center rod 54 abuts against the cylindrical pin 12, so that the center rod 54 is pushed to move in a direction away from the first through hole 216, so that the valve core is disengaged from the valve hole 215, so that the center valve 5 is in an open state, so that the hydraulic oil can be replenished from the valve hole 215 to the oil chamber formed by the first piston 31 and the piston chamber 11.

[0049] The push plate 53 is provided with a push hole, a push bearing is provided in the push hole, and the push rod 52 is fixedly provided in the push bearing. The setting of the push bearing allows the push plate 53 and the push rod 52 to be fixed in the axial direction, while in the radial circumferential direction, the push plate 53 and the push rod 52 can rotate freely. When the spiral strip 511 on the valve core and the spiral groove 218 in the valve hole 215 cooperate, the valve core can rotate smoothly, so that the valve core and the valve hole 215 can cooperate more smoothly.

[0050] In the present invention, by providing a spiral groove 218 on the inner wall of the valve hole 215 and a spiral strip 511 on the outer wall of the valve core, the spiral groove 218 can be used to increase the oil replenishment space of the valve hole 215, so that the valve hole 215 can improve the efficiency of oil replenishment. And through the cooperation of the spiral strip 511 and the spiral groove 218, the valve core and the valve hole 215 are equivalent to "unscrewing the bottle cap" when they are in cooperation, thereby improving the sealing performance between the spiral strip 511 and the spiral groove 218, so that the sealing effect in the working state can be better improved.

[0051] Example 3: Reference Figure 1 and Figure 2 As shown, the structure of this embodiment is similar to that of embodiment 1 and embodiment 2, except that a second valve core 5555 is fixedly arranged on the push rod 52, the diameter of the second valve core 55 is larger than the diameter of the valve hole 215, and the diameter of the second valve core 55 is smaller than the diameter of the second through hole 217; the second valve core 55 is fixedly arranged between the push plate 53 and the first valve core 51. A plurality of sealing convex rings are concentrically arranged on the end of the second valve core 55 close to the valve hole 215.

[0052] By providing a second sealing feature for auxiliary sealing, when in the working state, the thrust spring pushes the valve core and the valve hole 215 to fully match, and the second valve core 55 abuts against the end of the valve hole 215, and the second valve core 55 blocks the valve hole 215, thereby achieving a secondary sealing effect on the valve hole 215. In addition, by providing a sealing convex ring at the end of the second valve core 55, the sealing effect between the second valve core 55 and the end of the valve hole 215 can be improved.

[0053] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A brake master cylinder, characterized in that: include: A cylinder body, wherein a first piston assembly and a second piston assembly are arranged in the cylinder body, wherein a central valve is arranged in each of the first piston assembly and the second piston assembly, wherein the central valve comprises a valve hole, a first valve core and a pushing component for pushing the first valve core to cooperate with the valve hole, wherein a plurality of spiral grooves are arranged on the inner side wall of the valve hole, and a plurality of spiral strips cooperating with the spiral grooves are arranged on the outer side wall of the first valve core.

2. The brake master cylinder according to claim 1, characterized in that: The pushing component comprises a pushing spring and a pushing rod fixedly arranged at one end of the first valve core, a pushing disk is arranged in the circumferential direction of the pushing rod, and the pushing spring and the pushing disk are in contact with each other.

3. The master brake cylinder according to claim 2, characterized in that: A pushing hole is arranged on the pushing plate, a pushing bearing is arranged in the pushing hole, and a pushing rod is fixedly arranged in the pushing bearing.

4. The master brake cylinder according to claim 2, characterized in that: A second valve core at the end is also fixedly arranged on the push rod, and the diameter of the second valve core is larger than the diameter of the valve hole; the second valve core is arranged between the push disk and the first valve core.

5. The brake master cylinder according to any one of claims 2 to 4, characterized in that: The second piston assembly includes a second piston and a first convex ring and a second convex ring arranged on the periphery of the second piston. The first convex ring and the second convex ring cooperate to form a first ring groove, and a first sealing ring is arranged in the first ring groove.

6. The master brake cylinder according to claim 5, characterized in that: The valve hole is arranged along the axis of the second piston, and a first through hole and a second through hole are respectively arranged at both ends of the valve hole in the axial direction. The diameters of the first through hole, the valve hole and the second through hole gradually increase in sequence.

7. The master brake cylinder according to claim 5, characterized in that: A center rod is arranged at the end of the first valve core away from the push spring; and a cylindrical pin is arranged along the radial direction of the cylinder body.

8. The master brake cylinder according to claim 4, characterized in that: A plurality of sealing convex rings are coaxially arranged at the end of the second valve core close to the valve hole.

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