Plunger type brake master cylinder with piston assembly

Abstract

The piston assembly is further arranged in a cylinder body of the plunger type brake master cylinder, the front end of a rear piston of the piston assembly is provided with an annular limiting flange, a rear end opening of a cylinder hole is in threaded connection with a leather ring screwing seat, an inner hole of the leather ring screwing seat is provided with a rear leather ring groove, and a rear leather ring is installed on the rear leather ring groove. The rear piston penetrates through an inner hole of the leather ring rotary connection seat in a matched mode, the rear leather ring is located between the rear piston and the leather ring rotary connection seat, and an annular limiting flange on the rear piston is arranged on the front side of the leather ring rotary connection seat in a matched mode and matched with the front edge of the leather ring rotary connection seat in a limiting mode. The rear end opening of the cylinder body is in threaded connection with the leather ring screwing seat, so that the rear end opening of the cylinder body is relatively enlarged, then the leather ring screwing seat is installed, the rear leather ring groove is formed in an inner hole of the leather ring screwing seat, manufacturing and machining of the rear leather ring groove are facilitated, the rear piston is limited through cooperation of the leather ring screwing seat, the rear piston is prevented from being disengaged from the inner hole of the leather ring screwing seat, and the service life of the rear piston is prolonged. After being assembled, the rear piston is blocked and cannot be separated from the cylinder body.

Description

Technical Field

[0001] The utility model relates to a plunger type brake master cylinder containing a piston assembly. Background Art

[0002] The housing of the plunger-type brake master cylinder is an integrated structure, and a piston is installed in the inner hole of the housing. A leather ring groove needs to be opened on the inner hole wall of the housing, and the oil circuit structure needs to be processed (such as drilling, etc.). This structure not only makes it easy for the piston to separate from the housing during transportation and assembly, but also it is difficult to open the leather ring groove on the narrow inner hole wall of the housing, and its accuracy and roughness are difficult to guarantee. The oil circuit structure is difficult to process and manufacture (such as drilling). Utility Model Content

[0003] In view of the technical problems existing in the background technology, the technical problem solved by the utility model is to provide a plunger type brake master cylinder containing a piston assembly in which the piston is not easy to disengage and subsequent optimization can make the leather ring groove processing and oil circuit structure processing relatively easier.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme: a plunger-type brake master cylinder containing a piston assembly, including a cylinder body, the cylinder body having a cylinder hole, and the cylinder body is also equipped with a piston assembly, the piston assembly includes a rear piston, and is characterized in that: the front end of the rear piston has an annular limiting flange, the rear port of the cylinder hole is threadedly connected to a leather ring rotation seat, the inner hole of the leather ring rotation seat is provided with a rear leather ring groove, the rear leather ring is installed on the rear leather ring groove, the rear piston matches and passes through the inner hole of the leather ring rotation seat, the rear leather ring is located between the rear piston and the leather ring rotation seat, the annular limiting flange on the rear piston is cooperatively arranged on the front side of the leather ring rotation seat, and the annular limiting flange is matched with the front edge limiting of the leather ring rotation seat.

[0005] The following various optimizations or supplementary explanations can be made on the above technical solutions respectively.

[0006] Among them, an internal thread is arranged on the rear port of the cylinder hole, an external thread is arranged outside the leather ring screw-on seat, and the internal thread and the external thread are matched and connected; a first sealing ring is also arranged between the cylinder hole and the leather ring screw-on seat.

[0007] In addition, a step support hole section is provided in the cylinder hole, and the step support hole section is also equipped with an inner sleeve. The front and rear parts of the inner sleeve are respectively sleeved in the step support hole section, and the front end of the leather ring screw-on seat is sleeved in the rear port of the inner sleeve; a front leather ring groove is also provided in the cylinder hole, and the front leather ring groove is located on the front side of the inner sleeve.

[0008] Among them, the front end of the inner sleeve axially rests on the cylinder body, the front end of the leather ring rotation seat axially rests on the rear port of the inner sleeve, the rear port of the inner sleeve is set as a step port, and a second sealing ring is also provided between the step port and the leather ring rotation seat, and the second sealing ring is sleeved on the leather ring rotation seat.

[0009] Among them, an oil gap is left between the outer wall of the inner sleeve and the inner wall of the cylinder hole, an oil receiving port is provided on the cylinder body, an oil inlet hole is provided between the oil receiving port and the cylinder hole, the oil inlet hole is connected with the oil gap, a third sealing ring is provided between the front end of the inner sleeve and the cylinder hole, the rear end of the inner sleeve has a supporting flange, the supporting flange is sleeved in the cylinder hole, an oil groove is provided on the supporting flange, an oil hole is provided on the leather ring screw-on seat, the oil groove is connected with the oil hole, and the oil hole is connected with the inner hole of the leather ring screw-on seat.

[0010] The beneficial effect of the utility model is that the rear port of the cylinder of the plunger-type brake master cylinder containing the piston assembly is threadedly connected to the apron rotating seat, so that the rear port of the cylinder becomes relatively larger under the same size, which is convenient for processing and manufacturing the structure in the cylinder body, and then the apron rotating seat is installed, and the corresponding rear apron groove is set on the inner hole of the apron rotating seat, which is convenient for manufacturing and processing the rear apron groove, and the apron rotating seat cooperates to limit the rear piston to prevent the rear piston from detaching from the inner hole of the apron rotating seat. After assembly, the rear piston is blocked and will not detach from the cylinder. Therefore, compared with the prior art, the utility model has substantial characteristics and progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following describes the relevant details and working principles of the implementation methods and embodiments of the present utility model in conjunction with the accompanying drawings.

[0012] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model.

[0013] Figure 2 for Figure 1 Surface view of the center rear piston.

[0014] Figure 3 for Figure 1 A three-dimensional view of the middle apron rotation seat.

[0015] Figure 4 for Figure 1 Schematic diagram of the structure of the middle leather ring rotation seat.

[0016] Figure 5 for Figure 4 Surface view.

[0017] Figure 6 for Figure 1 Schematic diagram of the three-dimensional structure of the inner sleeve.

[0018] In the figure: 1. cylinder body; 2. cylinder hole; 3. piston assembly; 4. rear piston; 5. annular limit flange; 6. leather ring screw-on seat; 7. rear leather ring groove; 8. rear leather ring; 9. first sealing ring; 10. step support hole section; 11. inner sleeve; 12. front leather ring groove; 13. step port; 14. second sealing ring; 15. oil gap; 16. oil receiving port; 17. oil inlet hole; 18. third sealing ring; 19. support flange; 20. oil groove; 21. oil hole. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the implementation of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field without making creative work based on the embodiments of the utility model are within the scope of protection of the utility model.

[0020] Referring to the accompanying drawings, the plunger-type brake master cylinder containing a piston assembly in the embodiment of the present embodiment includes a cylinder body 1 , the cylinder body 1 has a cylinder hole 2 , and the cylinder body 1 is also equipped with a piston assembly 3 , and the piston assembly 3 includes a rear piston 4 .

[0021] Among them, the front end of the rear piston 4 has an annular limiting flange 5 (i.e., a radial outer flange), and the rear port of the cylinder hole 2 is threadedly connected with a leather ring screw-on seat 6, that is, the leather ring screw-on seat 6 and the cylinder body 1 are separate structures and are connected and assembled by threaded connection.

[0022] Among them, the inner hole of the apron rotating seat 6 is provided with a rear apron groove 7, and the rear apron 8 is installed on the rear apron groove 7. The rear apron groove 7 on the apron rotating seat 6 is relatively easy to process, and the processing difficulty, precision and roughness can be guaranteed. The installation of the rear ring is also relatively convenient. After installation, it can be connected and assembled with the apron rotating seat 6 on the cylinder body 1 (the rear port).

[0023] The rear piston 4 matches and passes through the inner hole of the apron rotating seat 6, and the rear apron 8 is located between the rear piston 4 and the apron rotating seat 6. When assembling, the rear piston 4 is inserted from front to back into the inner hole of the apron rotating seat 6. Moreover, the annular limiting flange 5 on the rear piston 4 is matched and arranged at the front side of the apron rotating seat 6, and the annular limiting flange 5 is matched with the front edge of the apron rotating seat 6. The rear piston 4 is matched with the front edge of the apron rotating seat 6 through its annular limiting flange 5, and the annular limiting flange 5 of the rear piston 4 is blocked by the front edge of the apron rotating seat 6, so as to prevent the rear piston 4 from being separated from the inner hole of the apron rotating seat 6 and the cylinder body 1.

[0024] The plunger-type brake master cylinder containing a piston assembly has a rear port of the cylinder body 1 which is threadedly connected to a leather ring rotating seat 6, so that the rear port of the cylinder body 1 becomes relatively larger. The leather ring rotating seat 6 is then installed, and a corresponding rear leather ring groove 7 is set on the inner hole of the leather ring rotating seat 6, which is convenient for the production and processing of the rear leather ring groove 7. The leather ring rotating seat 6 cooperates to limit the rear piston 4 to prevent the rear piston 4 from detaching from the inner hole of the leather ring rotating seat 6. After assembly, the rear piston 4 is blocked and will not detach from the cylinder body 1.

[0025] The following optimization or further explanation may be performed based on the above embodiments.

[0026] For example, an internal thread is provided on the rear port of the cylinder hole 2, and an external thread 25 is provided on the outside of the leather ring screw-on seat 6. The internal thread and the external thread are matched and connected through threaded screw connection. A first sealing ring 9 is also provided between the cylinder hole 2 and the leather ring screw-on seat 6 to avoid leakage between the cylinder hole 2 and the leather ring screw-on seat 6. An annular groove can be provided on the outer ring of the leather ring screw-on seat 6 for the first sealing ring 9 to be set.

[0027] After further optimization, the cylinder bore 2 is provided with a step support hole section 10, and the step support hole section 10 is also equipped with an inner sleeve 11 (the outer side can be a tapered surface), the front and rear parts of the inner sleeve 11 are respectively sleeved in the step support hole section 10, and the inner sleeve 11 will be supported (front and back) by the step support hole section 10, and the front end of the leather ring screw-on seat 6 is sleeved in the rear port of the inner sleeve 11 for support; the relative diameter of the step support hole section 10 of the cylinder bore 2 of the cylinder body 1 is enlarged to facilitate internal processing. For example, a front leather ring groove 12 is also provided in the cylinder bore 2, and the front leather ring groove 12 is located on the front side of the inner sleeve 11. When the diameter is relatively large, the processing and production of the front leather ring groove 12 and the installation of the front leather ring will be more convenient, and the precision size and roughness will also be easier to guarantee.

[0028] The front end of the inner sleeve 11 axially abuts against the cylinder body 1, and the front end of the leather ring screw-on seat 6 axially abuts against the rear port of the inner sleeve 11, and the abutment and cooperation fixes the axial position of the inner sleeve 11; the rear port of the inner sleeve 11 is set as a step port 13, and a second sealing ring 14 is also provided between the step port 13 and the leather ring screw-on seat 6, and the second sealing ring 14 is sleeved on the leather ring screw-on seat 6, and the leather ring screw-on seat 6 can not only abut against the rear port of the inner sleeve 11 for axial positioning, but also can be supported in the rear port of the inner sleeve 11, and use the second sealing ring 14 to avoid leakage and cooperate to form an oil circuit.

[0029] In addition, an oil gap 15 (i.e., oil space) is left between the outer wall of the inner sleeve 11 and the inner wall of the cylinder hole 2. An oil receiving port 16 is provided on the cylinder body 1 for the inflow and outflow of brake fluid. An oil inlet hole 17 is provided between the oil receiving port 16 and the cylinder hole 2. The oil inlet hole 17 is connected to the oil gap 15. The oil gap 15 is connected to the oil receiving port 16 through the oil inlet hole 17. A third sealing ring 18 is provided between the front end of the inner sleeve 11 and the cylinder hole 2 to form an oil circuit. The rear end of the inner sleeve 11 has a supporting flange 19, and the supporting flange 19 is sleeved in the cylinder hole 2. An oil groove 20 (i.e., an oil passage) is provided on the supporting flange 19, and an oil hole 21 is provided on the leather ring screw-on seat 6. The oil groove 20 is connected with the oil hole 21, and the oil hole 21 is connected with the inner hole of the leather ring screw-on seat 6, so that the oil receiving port 16 forms an oil path through the oil gap 15, the oil groove 20, and the oil hole 21; - the oil path structure originally on the cylinder body 1 with an integrated structure can be divided into the matching structure of the cylinder body 1, the inner sleeve 11, and the leather ring screw-on seat 6, thereby avoiding the problem that the oil path processing of the cylinder body 1 with an integrated structure is more difficult.

[0030] Among them, the rear leather ring 8 is arranged on the front and rear sides of the oil hole 21, and an oil groove 22 is also provided on the inner hole of the leather ring screw-on seat 6. The oil groove is located on the front side of the rear leather ring 8, and an oil hole 23 is also provided on the rear piston 4. All of them are the structures of the existing brake master cylinder and will not be repeated.

Claims

1. A plunger-type brake master cylinder including a piston assembly, comprising a cylinder body (1), the cylinder body (1) having a cylinder hole (2), a piston assembly (3) being arranged in the cylinder body (1), the piston assembly (3) including a rear piston (4), characterized in that: The front end of the rear piston (4) is provided with an annular limiting flange (5), the rear end of the cylinder hole (2) is threadedly connected to a leather ring rotating seat (6), the inner hole of the leather ring rotating seat (6) is provided with a rear leather ring groove (7), a rear leather ring (8) is installed on the rear leather ring groove (7), the rear piston (4) matches and passes through the inner hole of the leather ring rotating seat (6), the rear leather ring (8) is located between the rear piston (4) and the leather ring rotating seat (6), the annular limiting flange (5) on the rear piston (4) is arranged on the front side of the leather ring rotating seat (6), and the annular limiting flange (5) is matched with the front edge limiting of the leather ring rotating seat (6).

2. The plunger-type brake master cylinder with a piston assembly as claimed in claim 1, characterized in that: An internal thread is provided on the rear end of the cylinder hole (2), an external thread is provided on the outside of the leather ring screw-on seat (6), the internal thread and the external thread are matched and connected, and a first sealing ring (9) is also provided between the cylinder hole (2) and the leather ring screw-on seat (6).

3. The plunger-type brake master cylinder with a piston assembly as claimed in claim 1, characterized in that: The cylinder hole (2) has a step support hole section (10), the step support hole section (10) is also equipped with an inner sleeve (11), the front and rear parts of the inner sleeve (11) are respectively sleeved in the step support hole section (10), and the front end of the leather ring screw-on seat (6) is sleeved in the rear port of the inner sleeve (11); A front leather ring groove (12) is also provided in the cylinder hole (2), and the front leather ring groove (12) is located at the front side of the inner sleeve (11).

4. The plunger-type brake master cylinder with a piston assembly as claimed in claim 1, characterized in that: The front end of the inner sleeve (11) axially abuts against the cylinder body (1), and the front end of the leather ring rotation seat (6) axially abuts against the rear port of the inner sleeve (11). The rear port of the inner sleeve (11) is set as a step port (13). A second sealing ring (14) is further provided between the step port (13) and the leather ring rotation seat (6). The second sealing ring (14) is sleeved on the leather ring rotation seat (6).

5. The plunger-type brake master cylinder with a piston assembly as claimed in claim 1, characterized in that: An oil gap (15) is provided between the outer wall of the inner sleeve (11) and the inner wall of the cylinder hole (2); an oil receiving port (16) is provided on the cylinder body (1); an oil inlet hole (17) is provided between the oil receiving port (16) and the cylinder hole (2); the oil inlet hole (17) is communicated with the oil gap (15); a third sealing ring (18) is provided between the front end of the inner sleeve (11) and the cylinder hole (2); a supporting flange (19) is provided at the rear end of the inner sleeve (11); the supporting flange (19) is sleeved in the cylinder hole (2); an oil groove (20) is provided on the supporting flange (19); an oil hole (21) is provided on the leather ring rotating seat (6); the oil groove (20) is communicated with the oil hole (21); and the oil hole (21) is communicated with the inner hole of the leather ring rotating seat (6).

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