Lightweight brake shell with machining positioning structure

Abstract

The utility model provides a light-weight brake shell with a machining positioning structure. The light-weight brake shell comprises a shell body and shell connecting supporting lugs. A piston cavity is formed between the shell main body and the shell connecting support lug; the shell connecting support lug is arranged at the inlet end of the piston cavity and is integrally connected with the shell main body; a three-point positioning structure is arranged on the shell main body, and the three-point positioning structure is arranged on the same side of the shell main body and is located at the top of the shell main body; the three-point positioning structure comprises a conical positioning ball pit, a V-shaped positioning groove and a plane positioning groove. An oil inlet and a deflation valve are arranged on the two sides of the top of the shell body corresponding to the inlet end of the piston cavity respectively, and the oil inlet and the deflation valve are symmetrical about the axial longitudinal section of the shell; oil pipe anti-rotation features are further fixedly arranged on the two sides of the top of the shell body. And exhaust grooves are horizontally and symmetrically formed in the inner wall of a piston cavity formed by the shell connecting support lugs and the shell main body.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile brake structure design, and relates to a light-weight brake shell with machining positioning structure. BACKGROUND

[0002] The traditional single-piston brake shell has machining positioning problems, adopts a traditional positioning point form, that is, a symmetrical circular / square positioning structure, has low machining positioning precision, and is prone to cause reference deviation due to slight deviation during multiple clamping or high-speed machining, thereby affecting the coaxiality and position precision of the piston cavity, oil passage and the like, and further causing brake fluid leakage or friction plate eccentric wear; meanwhile, the structure has redundancy problems, the piston has large diameter and long length, and multiple connecting ears are arranged in the middle part of the piston cavity, the layout is not reasonable, the overall structure is loose, and it is difficult to realize light weight; in addition, the structure has strength and cost problems, the wall thickness needs to be additionally increased at the exhaust feature to meet the strength requirement, the material cost is increased, and the asymmetric design of the exhaust valve hole and the oil inlet hole forces the development of two sets of molds, the mold development cost is increased, and the manufacturing cost is significantly increased. SUMMARY

[0003] In order to solve the problems in the prior art, the utility model aims to provide a light-weight brake shell with machining positioning structure, which can make the machining of the shell more accurate, and the component structure does not need to be additionally thickened to be more lightweight.

[0004] The utility model provides a light-weight brake shell with machining positioning structure, which comprises a shell main body and a shell connecting lug.

[0005] A three-point positioning structure is arranged on the shell main body and used for accurately positioning the position of the shell during machining; the three-point positioning structure is arranged on the same side of the shell main body and located at the top of the shell main body; the three-point positioning structure comprises a conical positioning ball pit, a V-shaped positioning groove and a planar positioning groove; the three-point positioning structure can accurately position the position of the shell during machining.

[0006] During machining, the three-point positioning structure is located in the same side mold of the upper and lower molds of the shell, so that the shell can be clamped once to complete all machining processes, and the machining efficiency and precision are effectively improved.

[0007] The conical positioning ball pit is arranged at the top of the shell main body corresponding to the piston cavity inlet; the V-shaped positioning groove and the planar positioning groove are arranged at the top of the shell main body corresponding to the claw position.

[0008] The conical positioning ball pit has a 90°±3° angle and a 4mm depth;

[0009] The V-shaped positioning groove has a 90°±3° angle, a 5mm depth and a 10mm opening width.

[0010] The plane positioning slot has a 12mm diameter.

[0011] The conical positioning ball pit and the V-shaped positioning groove limit the translation of the shell in the horizontal direction and the rotation of the shell in the vertical direction and the horizontal direction perpendicular to the axis; and the plane positioning slot limits the movement of the remaining other degrees of freedom.

[0012] The other side of the lower part of the shell body relative to the conical positioning ball pit is provided with a first plane for machining clamping, and the other side of the lower part of the shell body relative to the V-shaped positioning groove and the plane positioning slot is provided with a second plane for machining clamping.

[0013] The top of the shell body corresponding to the position of the inlet end of the piston cavity is provided with an oil inlet and a gas discharge valve on both sides, and the oil inlet and the gas discharge valve are symmetrical about the axial longitudinal section of the shell;

[0014] The top of the shell body is also fixedly provided with an oil pipe anti-rotation feature, and left and right distinguishing marks are respectively cast on the oil pipe anti-rotation feature and integrally connected with the oil inlet and the gas discharge valve;

[0015] The shell connecting lug and the inner wall of the piston cavity formed by the shell body are horizontally and symmetrically provided with a gas discharge groove.

[0016] The beneficial effects that can be achieved by the utility model include: improved machining precision, better control of machining error, error reduced from ±0.1mm to ±0.05mm, shell clamping speed increased by 10% compared with the previous one, reduced from 5 minutes / piece to 4.5 minutes / piece, improved machining efficiency, reduced shell material, shell weight reduced by 30-50g under the condition of ensuring strength, and cost reduced, integrated exhaust feature design improves the overall strength of the shell, reduces stress concentration, and local stress is reduced by about 40MPa, symmetrical design saves mold development cost, and single set cost is reduced by about 20%. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0018] Figure 1 is the shell structure plan view of the utility model.

[0019] Figure 2 is the shell connecting lug related structure vertical to the axial direction A-A plane cross-sectional view of the utility model.

[0020] Figure 3 is the axial B-B plane cross-sectional structure of the shell connecting lug related structure of the utility model.

[0021] Figure 4 is the shell structure bottom view of the utility model.

[0022] Figure 5 is the contact schematic diagram of the conical positioning ball pit and the fixture positioning point when the utility model is implemented.

[0023] Figure 6 is the contact schematic diagram of the V-shaped positioning groove and the fixture positioning point when the utility model is implemented.

[0024] Figure 7 is the shell structure plan view of the prior art.

[0025] In the figure, 1 is an oil inlet or a gas release valve, 2 is a conical positioning ball pit, 3 is a V-shaped positioning groove, 4 is a plane positioning groove, 5 is an oil pipe anti-rotation feature, 6 is an exhaust groove, 7 is a shell connecting lug, 8 is a first plane, 9 is a second plane, 10 is a conical positioning ball pit fixture positioning ball, 11 is a V-shaped positioning groove fixture positioning ball, and 12 is a shell main body. DETAILED DESCRIPTION

[0026] The utility model is further explained in detail in combination with the following specific embodiments and drawings. The process, conditions, experimental methods and the like for implementing the utility model are the general knowledge and common sense in the art except for the following specifically mentioned contents, and the utility model has no special limitation contents.

[0027] The utility model is designed to facilitate machining and reduce the overall weight of the structure to solve the problems of machining deviation, poor precision, large shell weight, additional increase in wall thickness at the exhaust feature, and division of left and right parts of the shell casting mold in traditional caliper shell machining.

[0028] As shown in Figures 1-7 The utility model provides a light-weight brake shell with machining positioning structure, which comprises a shell main body 12 and a shell connecting lug 7; a piston cavity is formed in the middle of the shell main body 12 and the shell connecting lug 7; the shell connecting lug 7 is installed and arranged at the top end of the piston cavity inlet and is integrally connected with the shell main body 12.

[0029] The shell body 12 is provided with a three-point positioning structure for accurately positioning the position of the shell during processing; the three-point positioning structure is arranged on the same side of the shell body 12 and is located at the top of the shell body 12; the three-point positioning structure comprises a conical positioning ball pit 2, a V-shaped positioning groove 3 and a flat positioning groove 4; the three-point positioning structure can accurately position the position of the shell during processing; according to the actual working condition, the three-point positioning structure can also be further adjusted or improved;

[0030] During processing, the three-point positioning structure is located in the same side mold of the upper and lower molds of the shell, which ensures that the shell can complete all processing procedures after being clamped once, effectively improving the processing efficiency and precision;

[0031] The conical positioning ball pit 2 is arranged at the top of the shell body 12 corresponding to the inlet of the piston cavity; the V-shaped positioning groove 3 and the flat positioning groove 4 are arranged at the top of the shell body 12 corresponding to the claw position;

[0032] The conical angle of the conical positioning ball pit 2 is 90°±3°, and the depth is 4mm;

[0033] The included angle of the V-shaped positioning groove 3 is 90°±3°, the depth is 5mm, and the opening width is 10mm;

[0034] The diameter of the flat positioning groove 4 is 12mm.

[0035] The conical positioning ball pit 2 and the V-shaped positioning groove 3 limit the translation of the shell in the horizontal direction, and the rotation in the vertical direction and the horizontal direction perpendicular to the axis; the flat positioning groove 4 limits the movement of the remaining other degrees of freedom.

[0036] The lower part of the shell body 12 is provided with a first flat surface 8 for machining clamping on the other side of the conical positioning ball pit 2, and the lower part of the shell body 12 is provided with a second flat surface 9 for machining clamping on the other side of the V-shaped positioning groove 3 and the flat positioning groove 4.

[0037] The top of the shell body 12 corresponding to the position of the inlet end of the piston cavity is provided with an oil inlet and a gas valve on both sides, and the oil inlet and the gas valve are symmetrical about the axial longitudinal section of the shell;

[0038] The top of the shell body 12 is also fixedly provided with an oil pipe anti-rotation feature 5, and the oil pipe anti-rotation feature 5 is provided with left and right distinguishing marks by casting respectively, and is integrally connected with the oil inlet and the gas valve respectively;

[0039] The oil inlet and the air release valve are arranged at the positions of the two sides of the top of the shell main body, which can be selected according to actual conditions, and are indicated by the structure number 1 in the drawings.

[0040] The horizontal symmetrical exhaust groove 6 is arranged on the inner wall of the piston cavity formed by the shell connecting lug 7 and the shell main body 12.

[0041] Embodiment 1

[0042] The light-weight brake shell with machining positioning structure is provided in the embodiment, and the first innovation in the utility model is a positioning point feature: a three-point positioning structure is adopted, three-point positioning can meet six-degree-of-freedom full constraint (3 translation + 3 rotation), and over-positioning or under-positioning is avoided.

[0043] The three-point positioning structure in the embodiment is a conical positioning ball pit 2, a V-shaped positioning groove 3 and a plane positioning groove 4. The conical positioning ball pit 2 can adaptively contact and compensate part of the blank error. The V-shaped positioning groove 3 has a strong guiding effect and cooperates with the conical positioning ball pit 2 to quickly align the axis. The plane positioning groove 4 provides a reference surface and eliminates residual degrees of freedom.

[0044] The conical positioning ball pit 2 is arranged at the corresponding position of the top of the shell main body 12 at the inlet end of the piston cavity, and the lower part of the shell opposite to the conical positioning ball pit 2 is provided with a first plane 8 for machining clamping.

[0045] The V-shaped positioning groove 3 and the plane positioning groove 4 are arranged at the corresponding position of the top of the shell main body 12 at the shell claw, and the second plane 9 is arranged at the lower claw of the shell opposite to the V-shaped positioning groove 3 and the plane positioning groove 4, which is used for machining clamping.

[0046] The conical positioning ball pit 2 and the V-shaped positioning groove 3 limit the translation of the shell in the horizontal direction and the rotation of the shell in the direction perpendicular to the axis and the horizontal direction perpendicular to the axis. On the basis of introducing the plane positioning groove 4, the remaining degrees of freedom of the shell are all fixed. Through the three-point positioning structure, accurate positioning of the shell during machining is realized, and the size deviation is ensured.

[0047] The conical positioning ball pit 2 used in the embodiment has strong adaptability to the accuracy of the contact surface, can adaptively reduce the dependence on the accuracy of the blank, and the contact between the conical positioning ball pit 2 and the conical positioning ball pit clamp positioning ball 10 is as shown in Figure 5The conical positioning ball pit 2 is designed with a 90° angle and a depth of 4mm to balance the stability of positioning, demolding feasibility and guiding effect. The V-shaped positioning groove 3 is designed to maximize the guiding contact surface between the fixture and the positioning point during clamping, with an angle of 90°, a depth of 5mm, and an opening width of 10mm. The contact between the V-shaped positioning groove 3 and the V-shaped positioning groove fixture positioning ball 11 is shown in Figure 6 The flat positioning groove 4 is designed with a diameter of 12mm, which is more conducive to clamping. When clamping the shell, the conical positioning ball pit 2 and the V-shaped positioning groove 3 can quickly position the workpiece to the theoretical axis position through the guiding effect, reducing the time of placing the part during processing.

[0048] Second, the shell connecting lug 7 is designed to be arranged at the inlet end of the piston cavity. According to the overall design requirements of the brake, when the brake is suitable for small-bore calipers and the designed friction plate is thinner than the ordinary brake friction plate, the length of the master cylinder can be shortened to achieve compact structure and lightweight processing. At the same time, the exhaust groove 6 and the shell connecting lug 7 feature are integrated, without the need for additional thickening treatment of the wall thickness at the exhaust groove 6. As shown in Figure 7 The existing technology exhaust feature and connecting lug are generally arranged up and down. The combination of the exhaust feature and the master cylinder has a relatively weak part with the master cylinder wall according to the different exhaust angles. At this time, the thin wall needs to be thickened.

[0049] The lightweight brake shell with machining positioning structure in the utility model can effectively reduce the shell mass and achieve the lightweight target. The air release valve feature and the oil inlet feature are designed symmetrically, which saves cost and reduces production line changeover time without developing two sets of molds. At the same time, in the anti-rotation feature, the cast "L" and "R" letters distinguish left and right parts. When "L" parts are needed, the original "R" is machined and removed because the oil pipe anti-rotation feature needs to be machined at the cast letter position. Thus, left and right parts are distinguished for error prevention and distinction in the subsequent process.

[0050] Example 2

[0051] A lightweight brake shell with machining positioning structure is provided in this embodiment. The shell adopts a three-point positioning structure to meet the six-degree-of-freedom full constraint.

[0052] The three-point positioning structure includes a conical positioning ball pit 2, a V-shaped positioning groove 3, and a flat positioning groove 4. The conical positioning ball pit 2 can adaptively contact and compensate for part of the blank error. The V-shaped positioning groove 3 has a strong guiding effect and cooperates with the conical positioning ball pit 2 to quickly align the axis. The flat positioning groove 4 provides a reference surface to eliminate residual degrees of freedom.

[0053] The conical positioning ball pit 2 is arranged at the top of the shell body 12 corresponding to the position of the piston cavity inlet end, and the lower part of the shell opposite to the conical positioning ball pit 2 is provided with a first plane 8 for machining clamping.

[0054] The V-shaped positioning groove 3 and the plane positioning groove 4 are arranged at the top of the shell body 12 corresponding to the position of the shell clamping jaw, and the lower part of the shell opposite to the V-shaped positioning groove 3 and the plane positioning groove 4 is provided with a second plane 9 for machining clamping.

[0055] The conical positioning ball pit 2, the V-shaped positioning groove 3 and the plane positioning groove 4 simultaneously limit the displacement and rotation of the shell in different degrees of freedom. Through the three-point positioning structure, accurate positioning of the shell during machining is realized, and size deviation is guaranteed.

[0056] The conical angle of the conical positioning ball pit 2 used in the embodiment is designed to be 93°, and the depth is designed to be 4mm; the included angle of the V-shaped positioning groove 3 is designed to be 93°, the depth is 5mm, and the opening width is 10mm; the plane positioning groove 4 is designed to be 12mm in diameter, which is more conducive to clamping. When clamping the shell, the conical positioning ball pit 2 and the V-shaped positioning groove 3 can quickly position the workpiece to the theoretical axis position through the guiding action, reducing the time of placing parts during processing.

[0057] Secondly, when designing the shell connecting lug 7, it is arranged at the position of the piston cavity inlet end, and the exhaust groove 6 and the shell connecting lug 7 are integrated, without the need for additional thickening treatment of the wall thickness of the exhaust groove 6.

[0058] Embodiment 3

[0059] The embodiment provides a light-weight brake shell with a machining positioning structure, the shell adopts a three-point positioning structure, and six degrees of freedom are fully constrained.

[0060] The three-point positioning structure is respectively a conical positioning ball pit 2, a V-shaped positioning groove 3 and a plane positioning groove 4. The conical positioning ball pit 2 can adaptively contact and compensate for part of the blank error. The V-shaped positioning groove 3 has a strong guiding effect and cooperates with the conical positioning ball pit 2 to quickly align the axis. The plane positioning groove 4 provides a reference surface to eliminate residual degrees of freedom.

[0061] The conical positioning ball pit 2 is arranged at the top of the shell body 12 corresponding to the position of the piston cavity inlet end, and the lower part of the shell opposite to the conical positioning ball pit 2 is provided with a first plane 8 for machining clamping.

[0062] The V-shaped positioning groove 3 and the plane positioning groove 4 are arranged at the top of the shell body 12 at the corresponding position of the shell clamping jaw, and a second plane 9 is arranged at the lower shell clamping jaw opposite to the V-shaped positioning groove 3 and the plane positioning groove 4, which is used for machining clamping.

[0063] The conical positioning ball pit 2, the V-shaped positioning groove 3 and the plane positioning groove 4 simultaneously limit the displacement and rotation of the shell in different degrees of freedom. Through the three-point positioning structure, accurate positioning of the shell during machining is realized, and size deviation is guaranteed.

[0064] In the embodiment, the conical angle of the conical positioning ball pit 2 is designed as 87°, and the depth is designed as 4mm; the included angle of the V-shaped positioning groove 3 is designed as 87°, the depth is 5mm, and the opening width is 10mm; the plane positioning groove 4 is designed as a diameter of 12mm, which is more beneficial to clamping. When clamping the shell, the conical positioning ball pit 2 and the V-shaped positioning groove 3 can quickly position the workpiece to the theoretical axis position through the guiding effect, and the time for placing the part during the machining process is reduced.

[0065] Secondly, when designing the shell connecting lug 7, the shell connecting lug 7 is arranged at the position of the inlet end of the piston cavity, and the exhaust groove 6 and the shell connecting lug 7 are integrated, so that the wall thickness of the exhaust groove 6 does not need to be thickened additionally.

[0066] The lightweight brake shell of the machining positioning structure in the utility model can improve the machining positioning precision of the shell and reduce the size deviation; the layout of the shell connecting lug 7 is optimized to realize compact structure and lightweight; the design of the exhaust groove 6 and the shell connecting lug 7 is integrated to avoid additional increase of the wall thickness; the air release valve and the oil inlet are designed symmetrically to reduce the mold development cost; the "L" and "R" are cast at the oil pipe anti-rotation feature 5 to facilitate subsequent error prevention and distinction.

[0067] In the description of the present application, it should be understood that the various indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, structure and operation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more said features.

[0068] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection, it can be direct connection, or indirect connection through intermediate medium, it can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0069] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0070] The present application discloses many different embodiments or examples to realize different structures of the present application. In order to simplify the disclosure of the present application, only the components and settings of specific examples are described in the embodiments. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0071] The protection scope of the utility model is not limited to the above embodiments. Changes and advantages that can be thought of by those skilled in the art without departing from the spirit and scope of the utility model are included in the utility model, and the appended claims are the protection scope.

Claims

1. A lightweight brake housing with a band machining positioning structure, characterized by, The casing body (12) and the casing connecting lug (7) form a piston cavity in the middle; the casing connecting lug (7) is installed at the entrance end of the piston cavity and is integrally connected with the casing body (12). The three-point positioning structure is arranged on the same side of the casing body (12) and is located at the top of the casing body (12); the three-point positioning structure comprises a conical positioning ball pit (2), a V-shaped positioning groove (3), and a flat positioning groove (4). The conical positioning ball pit (2) is arranged at the top of the casing body (12) corresponding to the entrance end of the piston cavity; the V-shaped positioning groove (3) and the flat positioning groove (4) are arranged at the top of the casing body (12) corresponding to the claw position.

2. The housing of claim 1, wherein The conical angle of the conical positioning ball pit (2) is 90°±3°, and the depth is 4mm; 3. The housing of claim 1, wherein The included angle of the V-shaped positioning groove (3) is 90°±3°, the depth is 5mm, and the opening width is 10mm; The diameter of the flat positioning groove (4) is 12mm. The conical positioning ball pit (2) and the V-shaped positioning groove (3) limit the translation of the casing in the horizontal direction and the rotation in the vertical direction and the horizontal direction perpendicular to the axis; the flat positioning groove (4) limits the movement of the remaining other degrees of freedom.

4. The housing of claim 2, wherein, The lower part of the casing body (12) is provided with a first flat surface (8) for machining clamping on the other side of the conical positioning ball pit (2); the lower part of the casing body (12) is provided with a second flat surface (9) for machining clamping on the other side of the V-shaped positioning groove (3) and the flat positioning groove (4).

5. The housing of claim 2, wherein The top of the casing body (12) corresponding to the entrance end of the piston cavity is provided with an oil inlet and a gas valve on both sides, respectively; the oil inlet and the gas valve are symmetrical about the axial longitudinal section of the casing.

6. The housing of claim 1, wherein The top of the casing body (12) is also fixedly provided with an oil pipe anti-rotation feature (5), and the oil pipe anti-rotation feature (5) is provided with left and right distinguishing marks, respectively, and is integrally connected with the oil inlet and the gas valve.

7. The housing of claim 6, wherein The casing connecting lug (7) and the casing body (12) form a piston cavity inner wall horizontally symmetrical opening with an exhaust groove (6).

8. The housing of claim 1, wherein ​

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