Novel oil supplementing master cylinder structure

Abstract

The utility model provides a novel oil recharging master pump structure which comprises a brake cylinder body and an oil valve device, a brake cavity is arranged in the brake cylinder body, a mounting groove is arranged on the outer side of the brake cylinder body, the brake cavity sequentially comprises a first cavity portion and a second cavity portion from an opening to the inside, the inner diameter of the first cavity portion is larger than that of the second cavity portion, and the inner diameter of the second cavity portion is larger than that of the first cavity portion. An oil inlet hole is further formed in the brake cylinder body and used for communicating the mounting groove with the first cavity part; the oil valve device is arranged in the mounting groove; according to the oil supplementing master cylinder structure, the first cavity portion and the second cavity portion of the brake cavity are designed to be of the different-diameter structure, the problem of fatigue caused by continuous braking is solved by means of the cross sectional area difference of the first cavity portion and the second cavity portion, and when the oil return hole is sealed, the oil return hole is sealed. Excess liquid generated in a unit distance can be supplemented to the second cavity part through a gap between the leather collars, so that the expected purpose that the brake oil liquid is not reduced for multiple times is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of brake assemblies, and in particular to a novel master pump structure. Background Technology

[0002] A common phenomenon with brake master cylinders on the market is that if the master cylinder is used for continuous braking within a short period, its braking force will gradually decrease. This is because after the initial braking is completed, during the retraction, the brake fluid flows along the gaps in the piston rings (such as...). Figure 11 When oil is added to the pressure chamber, but the product has not fully returned to its position, the oil level is affected by the clearance between the piston and the cylinder. The amount of oil added is not simply proportional to the amount of space the piston has retracted. This results in insufficient oil volume during short-term secondary braking, leading to less braking force during the first braking action. Furthermore, the braking force decreases with each subsequent braking action within a short period.

[0003] In view of this, the inventors have designed a novel oil replenishment pump structure, which leads to this invention. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a novel master pump structure. By designing the first and second chambers of the brake chamber as having different diameters, the difference in cross-sectional area between the first and second chambers overcomes the fatigue problem caused by continuous braking. When the return oil hole is sealed, excess fluid generated per unit distance will be replenished to the second chamber through the gap between the piston rings, thus achieving the expected goal of not reducing the fluid level after multiple braking cycles. Simultaneously, an oil valve device is installed in the mounting groove, allowing excess fluid in the first chamber to flow into the second chamber or back to the oil pump during the operation of the first piston, depending on the operating conditions. This overcomes the problem of fatigue in the braking system caused by continuous braking.

[0005] According to the present invention, a novel oil replenishment pump structure is provided, comprising:

[0006] A brake cylinder body, wherein a brake cavity is provided inside the brake cylinder body and a mounting groove is provided on the outside. The brake cavity includes a first cavity part and a second cavity part in sequence from the opening inward. The inner diameter of the first cavity part is larger than the inner diameter of the second cavity part. The brake cylinder body is also provided with an oil inlet hole for connecting the mounting groove and the first cavity part.

[0007] An oil valve device is disposed in a mounting groove;

[0008] The oil valve device includes:

[0009] The first oil inlet valve seat is disposed on the mounting groove base and has a first oil passage on its inner side;

[0010] The second oil inlet valve seat is sleeved on the first oil inlet valve seat and located inside the mounting groove. The second oil inlet valve seat is provided with a second oil passage that communicates with the first oil passage.

[0011] The push rod and the clamping spring are provided. The push rod is disposed inside the first oil inlet valve seat, and the clamping spring is disposed between the push rod and the second oil inlet valve seat. The push rod abuts against the first oil inlet valve seat through the clamping spring.

[0012] The master pump structure of this utility model overcomes the fatigue problem caused by continuous braking by designing the first and second chambers of the brake chamber as having different diameters. When the return oil hole is sealed, the excess oil generated per unit distance will be replenished to the second chamber through the gap between the rubber rings, thereby achieving the expected purpose of not reducing the amount of brake fluid after multiple braking operations. At the same time, an oil valve device is also provided in the mounting groove, so that when the first piston is operating, the excess oil in the first chamber will flow into the second chamber or flow back to the oil pump according to the working conditions.

[0013] In some embodiments of this utility model, the first cavity portion has a transition inclined surface that connects the first cavity portion and the second cavity portion.

[0014] In some embodiments of this utility model, a third oil passage is also provided on the second oil inlet valve seat. The third oil passage is far from the central axis of the second oil inlet valve seat and the number of such passages is greater than or equal to 1.

[0015] In some embodiments of this utility model, the main oil pump structure further includes a first sealing ring, which is disposed between the first oil inlet valve seat and the second oil inlet valve seat and located in the mounting groove.

[0016] In some embodiments of this utility model, the first sealing ring includes a vertical sealing portion sleeved on the outside of the first oil inlet valve seat, a horizontal sealing portion disposed at one end of the vertical sealing portion, and an inclined sealing portion disposed at the outer edge of the horizontal sealing portion; the inclined sealing portion is trumpet-shaped and the opening faces the first oil inlet valve seat.

[0017] In some embodiments of this utility model, a first clearance groove is provided on the first sealing ring corresponding to the third oil passage.

[0018] In some embodiments of this utility model, at least two third oil passages are provided, and at least two corresponding to the first clearance grooves are provided. When there are three or more third oil passages and three or more first clearance grooves, they are arranged in a circular array.

[0019] In some embodiments of this utility model, the first oil inlet valve seat is provided with a mounting cavity for mounting a push rod and a tightening spring, the mounting cavity connecting a first oil passage and a second oil passage; the push rod has an abutting part that abuts against the bottom of the mounting cavity and completely covers the opening of the first oil passage, and a stepped part disposed above the abutting part for mounting the tightening spring, one end of the tightening spring being mounted on the stepped part and contacting the abutting part, and the other end contacting the second oil inlet valve seat.

[0020] In some embodiments of this utility model, a first groove is provided at the bottom of the abutment portion, and the first groove passes through the central axis of the top rod.

[0021] In some embodiments of this utility model, the master pump structure further includes a piston assembly, which includes a first piston, a first elastic mechanism disposed at one end on the first piston, a second piston disposed at the other end of the first elastic mechanism, a second elastic mechanism disposed at one end on the second piston, a first main rubber ring sleeved on the outer wall of the first piston, a first auxiliary rubber ring disposed at one end of the first piston and limited by the first elastic mechanism, a second main rubber ring sleeved on the outer wall of the second piston, and a second auxiliary rubber ring disposed on the second piston and limited by the second elastic mechanism. The other end of the second elastic mechanism abuts against the bottom of the brake chamber. Both the first auxiliary rubber ring and the second auxiliary rubber ring are provided with a second clearance groove.

[0022] In some embodiments of this utility model, the first elastic mechanism includes a first pressure plate for restricting the first auxiliary ring onto the first piston, a first fixing rod with one end screwed to the first piston and for restricting the first pressure plate onto the first piston, a first fixing seat disposed on the first fixing rod and slidably connected to the first fixing rod, and a first spring disposed between the first pressure plate and the first fixing rod and located on the outer wall of the first fixing rod; the second elastic mechanism includes a second pressure plate for restricting the second auxiliary ring onto the second piston and sleeved on the outer wall of the second piston, and a second spring disposed between the second pressure plate and the bottom of the brake chamber.

[0023] In some embodiments of this utility model, the oil valve device is constrained at the bottom of the mounting groove by a C-shaped retaining ring. Attached Figure Description

[0024] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0025] in:

[0026] Figure 1 This is a schematic diagram of the structure of the main oil replenishment pump of this utility model;

[0027] Figure 2 This is a utility model Figure 1 A magnified view of a portion of the image;

[0028] Figure 3 This is a cross-sectional view of the oil valve structure of this utility model;

[0029] Figure 4 This is a utility model Figure 3 A magnified view of a portion of the image;

[0030] Figure 5 This is a schematic diagram of the structure of the push rod of this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the first sealing ring of this utility model;

[0032] Figure 7 This is a schematic diagram of the piston assembly of this utility model;

[0033] Figure 8 This is a utility model Figure 7 A magnified view of a portion of the image;

[0034] Figure 9 This is a schematic diagram of the flow of brake fluid during braking according to this utility model;

[0035] Figure 10 This is a schematic diagram of the flow of brake fluid after the formulation of this utility model;

[0036] Figure 11 This is the existing oil replenishment method.

[0037] Label Explanation:

[0038] 10. Brake cylinder body; 11. Brake chamber; 111. First chamber section; 1111. Transition inclined surface; 112. Second chamber section; 12. Mounting groove; 13. Oil inlet hole; 20. Oil valve device; 21. First oil inlet valve seat; 211. First oil passage; 22. Second oil inlet valve seat; 221. Second oil passage; 222. Third oil passage; 23. Push rod; 231. Abutment part; 2311. First groove; 232. Stepped part; 24. Tightening spring; 25. First sealing ring; 251. Vertical sealing part; 252, Horizontal sealing part; 2521, First clearance groove; 253, Inclined sealing part; 30, Snap ring; 40, Piston assembly; 41, First piston; 42, First elastic mechanism; 421, First pressure plate; 422, First fixing rod; 423, First fixing seat; 424, First spring; 43, Second piston; 44, Second elastic mechanism; 441, Second pressure plate; 442, Second spring; 45, First main rubber ring; 46, First auxiliary rubber ring; 461, Second clearance groove; 47, Second main rubber ring; 48, Second auxiliary rubber ring. Detailed Implementation

[0039] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0040] Please see Figures 1 to 10 This is a novel master pump structure for replenishing oil, as an embodiment of the present utility model. It includes a brake cylinder body 10 and an oil valve device 20. The brake cylinder body 10 has a brake cavity 11 inside and a mounting groove 12 on its outer side. The brake cavity 11, from its opening inwards, includes a first cavity portion 111 (or replenishing cavity) and a second cavity portion 112 (or pressure cavity). The inner diameter of the first cavity portion 111 is larger than the inner diameter of the second cavity portion 112. The brake cylinder body also has an oil inlet hole 13 for connecting the mounting groove 12 and the first cavity portion 111. The oil valve device 20 is disposed within the mounting groove 12. The oil valve device 20 includes: The system comprises a first inlet valve seat 21, a second inlet valve seat 22, a push rod 23, and a tensioning spring 24. The first inlet valve seat is mounted on the base of the mounting groove 12 and has a first oil passage 211 on its inner side. The second inlet valve seat 22 is sleeved on the first inlet valve seat 21 and located inside the mounting groove 12. The second inlet valve seat 22 has a second oil passage 221 that communicates with the first oil passage 211. The push rod 23 is located inside the first inlet valve seat 21, and the tensioning spring 24 is located between the push rod 23 and the second inlet valve seat 22. Through the tensioning spring 24, the push rod 23 abuts against the first inlet valve seat 21. When braking, the brake fluid in the first cavity is squeezed, generating pressure that overcomes the elastic potential energy of the tensioning spring 24 and pushes open the push rod 23. The brake fluid then flows into the oil pump (or oil cup) through the second oil passage 221. The master oil pump structure of this utility model is designed with the first cavity 111 and the second cavity 112 of the brake chamber 11 having different diameters. The difference in cross-sectional area between the first cavity 111 and the second cavity 112 is used to overcome the fatigue problem caused by continuous braking. When the return oil hole is sealed, the excess oil generated per unit distance will be replenished to the second cavity 112 through the gap between the rubber rings, thereby achieving the expected purpose of not reducing the amount of oil after multiple braking. At the same time, an oil valve device 20 is also provided in the mounting groove 12, so that when the first piston 41 is operating, the excess oil in the first cavity 111 will flow into the second cavity 112 or flow back to the oil pump according to the working conditions.

[0041] Please refer to the details. Figure 1 The first cavity 111 has a transition inclined surface 1111 that connects the first cavity 111 and the second cavity 112, so that the connection between the first cavity 111 and the second cavity 112 is smoother. The oil inlet hole 13 is provided on the transition inclined surface 1111.

[0042] Please refer to the details. Figure 3 The second oil inlet valve seat 22 is also provided with a third oil passage 222. The third oil passage 222 is far away from the central axis of the second oil inlet valve seat 22, and the number of them is greater than or equal to 1.

[0043] Please refer to the details. Figure 3 , Figure 4 , Figure 6 The main oil pump structure also includes a first sealing ring 25, which is disposed between the first oil inlet valve seat 21 and the second oil inlet valve seat 22 and located within the mounting groove 12. The first sealing ring 25 includes a vertical sealing part 251 sleeved on the outside of the first oil inlet valve seat 21, a horizontal sealing part 252 disposed at one end of the vertical sealing part 251, and an inclined sealing part 253 disposed at the outer edge of the horizontal sealing part 252. The inclined sealing part 253 is funnel-shaped and its opening faces the first oil inlet valve seat 21. The vertical sealing part 251 is located between the first oil inlet valve seat 21 and the second oil inlet valve seat 22, and the horizontal sealing part 252 is located between the end faces of the first oil inlet valve seat 21 and the second oil inlet valve seat 22 to ensure the sealing between the first oil inlet valve seat 21 and the second oil inlet valve seat 22. The inclined sealing part 253 abuts against the inner wall of the mounting groove 12. A first clearance groove 2521 is provided on the first sealing ring 25 corresponding to the third oil passage 222. At least two third oil passages 222 are provided, and at least two corresponding first clearance grooves 2521 are provided. When there are three or more third oil passages 222 and first clearance grooves 2521, they are arranged in a circumferential array. The first clearance groove 2521 is located at the edge of the horizontal sealing ring and extends towards the inclined sealing portion 253. By providing the first sealing ring 25, it can be ensured that when brake fluid returns to the pump, the brake fluid only flows in through the first oil passage 211 and the second oil passage 221. After braking, the brake fluid in the pump flows into the first brake chamber 11 or the second brake chamber 11 through the third oil passage 222 or the second flow passage 221 and the first flow passage 211. Specifically, during braking, the brake fluid is squeezed, generating pressure inside the horizontal sealing part 252 and the inclined sealing part 253. The outer edge of the inclined sealing part 253 is tightly fitted with the inner wall of the mounting groove 12, ensuring the sealing between the first sealing ring 25 and the mounting groove 12. After braking, the brake fluid in the pump needs to flow back into the first cavity part 111, that is, the brake fluid passes through the third flow channel 222 and generates pressure on the first sealing ring 25. The inclined sealing part 253 contracts inward, creating a gap between the outer edge of the first sealing ring 25 and the mounting groove 12. The first clearance groove 2521 makes it easier for the inclined part of the first sealing ring to contract, ensuring the stability of the brake fluid return.

[0044] Please refer to the details. Figure 3 , Figure 5The first oil inlet valve seat 21 is provided with a mounting cavity for mounting the push rod 23 and the clamping spring 24. The mounting cavity connects the first oil passage 211 and the second oil passage 221. The push rod 23 has an abutment portion 231 that abuts against the bottom of the mounting cavity and completely covers the opening of the first oil passage 211, and a stepped portion 232 provided above the abutment portion 231 for clamping the spring 24. One end of the clamping spring 24 is sleeved on the stepped portion 232 and contacts the abutment portion 231, and the other end contacts the second oil inlet valve seat 22. A first groove 2311 is provided at the bottom of the abutment portion 231. The first groove 2311 passes through the central axis of the push rod 23. The first groove 2311 can prevent the bottom of the abutment portion 231 from being too tightly fitted to the bottom of the mounting cavity, making the push rod 23 relatively easy to push open.

[0045] For details, please refer to Figure 1 , Figure 7 , Figure 8The master pump structure also includes a piston assembly 40, which includes a first piston 41, a first elastic mechanism 42 with one end disposed on the first piston 41, a second piston 43 disposed at the other end of the first elastic mechanism, a second elastic mechanism 44 with one end disposed on the second piston 43, a first main rubber ring 45 sleeved on the outer wall of the first piston 41, a first auxiliary rubber ring 46 disposed at one end of the first piston 41 and limited by the first elastic mechanism 42, a second main rubber ring 47 sleeved on the outer wall of the second piston 43, and a first auxiliary rubber ring 46 disposed on the second piston 43 and limited by the first elastic mechanism 42. The second elastic mechanism 44 limits the second auxiliary ring 48. The other end of the second elastic mechanism 44 abuts against the bottom of the brake cavity 11. The first auxiliary ring 46 and the second auxiliary ring 48 are both provided with a second relief groove 461. The second relief groove 461 makes it easier for the brake fluid to flow back into the second brake cavity (for a detailed explanation of the principle, refer to the first sealing ring 25). Combined with the differential diameter design of this utility model, it makes it easier for the brake fluid in the first brake cavity to flow into the second brake cavity, so as to better solve the fatigue problem caused by continuous braking in the existing structure. The first elastic mechanism 42 includes a first pressure plate 421 for restricting the first set of rubber rings 46 onto the first piston 41, a first fixing rod 422 with one end screwed to the first piston 41 and for restricting the first pressure plate 421 onto the first piston 41, a first fixing seat 423 disposed on and slidably connected to the first fixing rod 422, and a first spring 424 disposed between the first pressure plate 421 and the first fixing rod and located on the outer side wall of the first fixing rod 422. The second fixing rod passes through the first fixing seat 423 and the first pressure plate 421, and is screwed to one end of the first piston 41. After being installed in place, the first pressure plate 421 causes the first set of rubber rings 46 to be restricted to the first piston 41. The rubber ring 46 is easier to install, eliminating the need for it to be fitted onto the outer wall of the first piston 41, which greatly improves the installation efficiency of the first rubber ring 46. The second elastic mechanism 44 includes a second pressure plate 441 for restricting the second rubber ring 48 onto the second piston 43 and fitted onto the outer wall of the second piston 43, and a second spring 442 disposed between the second pressure plate 441 and the bottom of the brake chamber. The second rubber ring 48 is also fitted onto the second pressure plate 441. The second rubber ring 48 can be fixed to the outer wall of the second piston 43, which also improves the installation efficiency of the second rubber ring 48, thereby improving the installation efficiency of the piston assembly 40.

[0046] Please refer to the details. Figure 2 The oil valve device 20 is restricted to the bottom of the mounting groove 12 by a C-shaped retaining ring 30. The retaining ring can restrict the oil valve device 20 to the bottom of the mounting groove 12 more quickly and stably, thereby improving assembly efficiency.

[0047] In existing structures, oil is drawn from the oil replenishment chamber through the gap between the piston and cylinder during the return stroke, relying solely on the vacuum created during the stroke. However, due to limitations in the gap size and time, the oil replenished by the pressure chamber cannot completely fill it. This invention addresses this by designing the oil replenishment chamber and pressure chamber of the first piston 41 with different diameters, and by installing an oil valve device 20 in the mounting groove 12 corresponding to the oil replenishment chamber. This allows excess oil in the oil replenishment chamber during the operation of the first piston 41 to flow either into the pressure chamber or back into the oil cup, depending on the operating conditions. This solves the problem of decreasing braking force after repeated braking in a short period.

[0048] In summary, the master pump structure of this invention overcomes the fatigue problem caused by continuous braking by designing the first and second chambers of the brake chamber with different diameters. The difference in cross-sectional area between the first and second chambers is utilized. When the return port is sealed, excess fluid generated per unit distance is replenished to the second chamber through the gap between the piston rings, thus achieving the desired goal of maintaining fluid levels even after multiple braking maneuvers. Simultaneously, an oil valve device is installed in the mounting groove, allowing excess fluid in the first chamber to flow into the second chamber or back into the pump during the operation of the first piston, depending on the operating conditions. Therefore, the master pump structure of this invention effectively changes the replenishment method of the first brake chamber, solving the problem of decreasing braking force after repeated braking in a short period.

[0049] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A novel oil makeup pump structure, characterized by, The application relates to a structure of a total oil supply pump, which comprises a brake cylinder body, an oil valve device and a piston assembly. The brake cylinder body is internally provided with a brake cavity, and externally provided with a mounting groove; the brake cavity comprises a first cavity part and a second cavity part from an opening inwards; the inner diameter of the first cavity part is larger than that of the second cavity part; the brake cylinder body is further provided with an oil inlet hole for connecting the mounting groove and the first cavity part. The oil valve device is arranged in the mounting groove. The oil valve device comprises a first oil inlet valve seat, a second oil inlet valve seat, a top rod and a top spring. The first oil inlet valve seat is arranged on the bottom of the mounting groove and internally provided with a first oil passing channel. The second oil inlet valve seat is arranged on the first oil inlet valve seat and internally provided with a second oil passing channel communicated with the first oil passing channel. The top rod is arranged in the first oil inlet valve seat, and the top spring is arranged between the top rod and the second oil inlet valve seat.

2. A novel oil replenishing main pump structure according to claim 1, characterized in that, The first cavity part is internally provided with a transition inclined surface between the first cavity part and the second cavity part.

3. A novel oil makeup pump arrangement as claimed in claim 1, wherein, The second oil inlet valve seat is further provided with a third oil passing channel, which is away from the central axis of the second oil inlet valve seat and the number of the third oil passing channels is greater than or equal to one.

4. A novel oil replenishing main pump structure according to claim 3, characterized in that, The total oil supply pump structure further comprises a first sealing ring, which is arranged between the first oil inlet valve seat and the second oil inlet valve seat and in the mounting groove.

5. A novel oil replenishment main pump structure according to claim 4, characterized in that, The first sealing ring comprises a vertical sealing part arranged outside the first oil inlet valve seat, a horizontal sealing part arranged at one end of the vertical sealing part and an inclined sealing part arranged at the outer edge of the horizontal sealing part.

6. A novel oil replenishing main pump structure according to claim 4, characterized in that, The inclined sealing part is trumpet-shaped and the opening is towards the first oil inlet valve seat.

7. A novel oil replenishing main pump structure according to claim 1, characterized in that, The first sealing ring is provided with a first avoiding groove corresponding to the third oil passing channel.

8. A novel oil replenishment main pump structure according to claim 7, characterized by The first oil inlet valve seat is provided with a mounting cavity for arranging the top rod and the top spring, and the mounting cavity is communicated with the first oil passing channel and the second oil passing channel.

9. A novel oil replenishing main pump structure according to claim 1, characterized in that, The top rod has an abutting part abutting the bottom of the mounting cavity and completely covering the opening of the first oil passing channel, and a step part arranged above the abutting part and used for arranging the top spring.

10. A novel oil replenishing main pump structure according to claim 1, characterized in that, The abutting part is provided with a first groove passing through the central axis of the top rod. The piston assembly comprises a first piston, a first elastic mechanism arranged at one end of the first piston, a second piston arranged at the other end of the first elastic mechanism, a second elastic mechanism arranged at one end of the second piston, a first main ring arranged outside the first piston, a first auxiliary ring arranged at one end of the first piston and limited by the first elastic mechanism, a second main ring arranged outside the second piston, and a second auxiliary ring arranged on the second piston and limited by the second elastic mechanism. The second end of the second elastic mechanism abuts the bottom of the brake cavity, and the first auxiliary ring and the second auxiliary ring are both provided with a second avoiding groove. The oil valve device is limited by a C-shaped snap ring at the bottom of the mounting groove.

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