Brake cam rotating shaft

Abstract

The utility model discloses a brake cam rotating shaft, which relates to the technical field of cam shafts and comprises a cam rotating shaft component which comprises a cam part, a cylindrical shaft positioning part fixedly arranged at the lower end of the cam part and a rocker arm embedding part fixedly arranged at the bottom end of the cylindrical shaft positioning part. The center of the cylindrical shaft positioning part is provided with an inward-concave oil lubricating groove unit, the oil lubricating groove unit is of a ladder-shaped inward-concave structure, the rocker arm embedding part comprises an upper embedding part and a lower embedding part which are arranged in a mirror image mode, a stress bearing part is fixedly arranged between the upper embedding part and the lower embedding part, the upper embedding part and the lower embedding part each comprise a limiting boss, and the limiting bosses are arranged on the upper embedding part and the lower embedding part. Embedded tooth blocks are evenly distributed on the outer edge of the limiting boss and are of a ladder-shaped outwards-protruding structure. By improving the lubricating oil groove units, the lubricating effect is enhanced, and friction is reduced; the stress bearing part is optimized, and the stress is uniformly dispersed to improve the stress resistance of the structure; the design of the rocker arm embedding part is improved, and the assembling fixity and the safety of the brake are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of camshafts, in particular to a brake cam shaft. Background Art

[0002] When the brake is applied, the rocker arm rotates to drive the camshaft to rotate, so that the left and right brake shoe assemblies rotate left and right around the fixed axis and open to achieve the braking effect. The brake is an indispensable and important safety component in vehicles such as bicycles and electric bicycles. The reliability and sensitivity of its operation are directly related to the life safety of the user. Prior art such as CN218440334U discloses a brake camshaft. Although this structure can store a lubricating layer through a lubricating seat to reduce the friction between the camshaft and the brake box and avoid the camshaft from being stuck or rusted during rotation, there are still many problems during use:

[0003] 1. Stress concentration problem: Although the existing technology buffers the stress on the lubrication storage section through an arc-shaped structure, the actual stress of the overall structure is mainly concentrated in the part connected to the rocker arm, so that the overall structure still fails to fully solve the stress concentration problem, which can easily cause the part connected to the rocker arm to deform or be damaged under high stress conditions, affecting the service life of the brake.

[0004] 2. Poor assembly fixation: The existing rocker arm locking structure has an unsatisfactory fit when connected to the rocker arm, which can easily lead to loose connection parts and affect the transmission performance and safety of the brake.

[0005] 3. Limited lubrication effect: Although the existing lubrication storage section design can store a certain amount of lubricating oil, the lubricating oil is easily exhausted after high-frequency or long-term use, resulting in a decrease in lubrication effect and increased friction between the camshaft and the brake box, thereby affecting the sensitivity and reliability of the brake. Utility Model Content

[0006] The problem to be solved by the utility model is the concentrated stress distribution, poor assembly fixation and limited lubrication effect in the prior art. A brake cam shaft is provided which enhances the lubrication effect and reduces friction by improving the oil groove unit; optimizes the stress bearing part to evenly disperse the stress to improve the stress resistance of the structure; and improves the design of the rocker arm interlocking part to enhance the assembly fixation and the safety of the brake.

[0007] In order to solve the above problems, the utility model provides a brake cam shaft, including a cam shaft component, the cam shaft component including a cam portion, a cylindrical shaft positioning portion fixedly arranged at the lower end of the cam portion, and a rocker arm engaging portion fixedly arranged at the bottom end of the cylindrical shaft positioning portion, an inwardly concave oil groove unit is provided at the center of the cylindrical shaft positioning portion, the oil groove unit is a ladder-shaped inwardly concave structure, the rocker arm engaging portion includes an upper engaging portion and a lower engaging portion arranged in a mirror-like manner, a stress-bearing portion is fixedly arranged between the upper engaging portion and the lower engaging portion, the upper engaging portion and the lower engaging portion both include a limiting boss, the outer edges of the limiting bosses are evenly distributed with engaging tooth blocks, and the engaging tooth blocks are a ladder-shaped outwardly convex structure.

[0008] Preferably, the lubrication tank unit comprises four slanted oil inlet sections, and an inwardly concave lubrication storage section is provided at the center between the four slanted oil inlet sections.

[0009] Preferably, the stress bearing portion comprises an upper bearing column and a lower bearing column which are arranged in a mirror image.

[0010] Preferably, the upper bearing column is arranged to be larger at the top and smaller at the bottom from top to bottom, and the lower bearing column is arranged to be smaller at the top and larger at the bottom from top to bottom.

[0011] Preferably, the cam portion comprises a shoe clamping block arranged at the upper end, and a positioning snap ring is fixedly arranged at the bottom end of the shoe clamping block.

[0012] Preferably, the rocker arm engaging portion is connected to the rocker arm via an engaging gear block.

[0013] Preferably, the cam shaft component is cast from stainless steel into an integrally formed structure, which simplifies the manufacturing process, reduces production costs and improves production efficiency.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] 1. Optimize stress distribution: The utility model adopts an improved design of the stress bearing part, so that the upper bearing column and the lower bearing column are set in a mirror image, and adopt a structure of large upper and small lower and small upper and large lower respectively, which effectively disperses and alleviates the stress concentration problem, enhances the stress resistance of the structure, and prolongs the service life of the brake.

[0016] 2. Improve assembly reliability and fixation: The rocker arm engaging portion of the utility model is connected to the rocker arm through an engaging tooth block, and the engaging tooth block adopts a ladder-shaped convex structure, so as to better engage and position with the rocker arm, realize more reliable positioning and transmission functions, and further improve the safety performance and reliability of the brake.

[0017] 3. Enhanced lubrication performance: The oil tank unit of the present invention is designed as a ladder-shaped concave structure, which can more effectively store and distribute lubricating oil. It can quickly inlet and store oil or outlet and distribute oil through the oblique oil inlet sections in four directions, reducing the risk of depletion of lubricating oil, thereby ensuring the lubrication effect during long-term use and improving the sensitivity and reliability of the brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the cam shaft of the brake of the utility model.

[0019] Figure 2 It is a forward schematic diagram of the cam shaft of the brake of the utility model.

[0020] Figure 3 The utility model is a schematic diagram of the structure of the brake cam shaft installed on the brake disc.

[0021] Figure 4 The utility model is an assembly diagram of the brake cam shaft and the brake disc.

[0022] In the figure: 1-cam shaft component, 2-cam part, 201-shoe clamping block, 202-positioning snap ring, 3-cylindrical shaft positioning part, 301-oil groove unit, 302-oblique oil inlet section, 303-lubrication storage section, 4-rocker arm interlocking part, 400-upper interlocking part, 401-lower interlocking part, 402-limiting boss, 403-interlocking gear block, 410-stress bearing part, 411-upper bearing column, 412-lower bearing column, 5-gate box, 6-shoe, 7-rocker arm. DETAILED DESCRIPTION

[0023] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments.

[0024] Reference Figure 1-Figure 4 As shown, a brake cam shaft comprises a cam shaft component 1, wherein the cam shaft component 1 comprises a cam portion 2, a cylindrical shaft positioning portion 3 fixedly arranged at the lower end of the cam portion, and a rocker arm engaging portion 4 fixedly arranged at the bottom end of the cylindrical shaft positioning portion, wherein the rocker arm engaging portion 4 comprises an upper engaging portion 400 and a lower engaging portion 401 which are arranged in a mirror image, wherein a stress bearing portion 410 is fixedly arranged between the upper engaging portion 400 and the lower engaging portion 401, wherein the upper engaging portion 400 and the lower engaging portion 401 both comprise a limiting boss 402, wherein the outer edges of the limiting boss 402 are evenly distributed with engaging tooth blocks 403, wherein the engaging tooth blocks 403 are in a ladder-shaped outward convex structure, and the rocker arm engaging portion 4 is connected to the rocker arm via the engaging tooth blocks 403. The engaging tooth block 403 is connected to the rocker arm, and the engaging tooth block 403 adopts a ladder-shaped convex structure, so that it can be better engaged and positioned with the rocker arm, achieving more reliable positioning and transmission functions, and further improving the safety performance and reliability of the brake.

[0025] The stress bearing part 410 includes an upper bearing column 411 and a lower bearing column 412 which are arranged in a mirror image. The upper bearing column 411 is arranged to be larger at the top and smaller at the bottom from top to bottom, and the lower bearing column 412 is arranged to be smaller at the top and larger at the bottom from top to bottom. Through the improved design of the stress bearing part 410, the upper bearing column 411 and the lower bearing column 412 are arranged in a mirror image, and respectively adopt a structure of larger at the top and smaller at the bottom and smaller at the top and larger at the bottom, which effectively disperses and alleviates the problem of stress concentration, enhances the anti-stress performance of the structure, and prolongs the service life of the brake.

[0026] An inwardly concave lubricating tank unit 301 is provided at the center of the cylindrical shaft positioning portion 3. The lubricating tank unit 301 is a ladder-shaped inwardly concave structure. The lubricating tank unit 301 includes four oblique oil inlet sections 302. An inwardly concave lubricating storage section 303 is provided at the center between the four oblique oil inlet sections 302. The lubricating tank unit 301 of the present invention is designed as a ladder-shaped inwardly concave structure, which can more effectively store and distribute lubricating oil. The oil can be quickly inletted, stored, or discharged and distributed through the four oblique oil inlet sections 302, reducing the risk of running out of lubricating oil, thereby ensuring the lubrication effect during long-term use and improving the sensitivity and reliability of the brake.

[0027] The cam portion 2 includes a shoe clamping block 201 disposed at the upper end, and a positioning snap ring 202 is fixedly disposed at the bottom end of the shoe clamping block 201. The design of the shoe clamping block 201 improves the fixing stability of the shoe, ensuring that the shoe will not loosen or shift during the braking process, thereby enhancing the reliability of the brake. The fixed design of the positioning snap ring 202 simplifies the installation and adjustment process of the shoe, improves assembly efficiency, reduces operating steps, and facilitates maintenance and replacement. By ensuring that the shoe maintains the correct position and stability during the braking process, the positioning snap ring 202 further improves the overall safety performance of the brake and reduces the risk of brake failure caused by shoe displacement.

[0028] The cam shaft component 1 is cast from stainless steel into an integrally formed structure, which simplifies the manufacturing process, reduces production costs, and improves production efficiency.

[0029] In order to facilitate understanding of the above technical solution of the present invention, the above technical solution of the present invention is described in detail below through specific usage methods.

[0030] The specific assembly and working process are as follows: First, the lubricating oil is quickly guided to the lubrication storage section 303 through the oblique oil inlet section 302 of the oil groove unit 301 of the cylindrical shaft positioning part 3. The lubricating oil quickly enters or is distributed through the oblique oil inlet sections 302 in four directions, ensuring that the lubricating oil can continue to provide lubrication after high-frequency or long-term use, reducing the friction between the camshaft and the brake box, and improving the sensitivity and reliability of the brake. Then clamp the cam portion 2 of the cam shaft component 1 between the left and right brake shoes 6. The shoe clamping block 201 set on the cam portion 2 ensures the stability and correct position of the shoe during the clamping process. Then, the rocker arm interlocking portion 4 is connected to the preset locking seat position on the rocker arm 7. The interlocking tooth block 403 is interlocked to the upper and lower ends of the locking seat of the rocker arm 7 through a ladder-shaped convex structure, and then the two ends of the rocker arm 7 are fixed using a threaded connector to complete the assembly. When in use, the rocker arm 7 drives the cam shaft component 1 to rotate back and forth continuously, and the shoe clamping block 201 drives the brake shoe 6 to open left and right around the fixed axis to achieve a braking effect.

[0031] In the description of the present utility model, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0032] It should be noted that, in the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] The above description is only a specific embodiment of the utility model, so that those skilled in the art can understand or implement the utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but should conform to the widest range consistent with the principles and novel features of the utility model described herein.

Claims

1. A brake cam shaft, comprising a cam shaft component (1), the cam shaft component (1) comprising a cam portion (2), a cylindrical shaft positioning portion (3) fixedly arranged at the lower end of the cam portion, and a rocker arm fitting portion (4) fixedly arranged at the bottom end of the cylindrical shaft positioning portion, characterized in that: An inwardly concave oil groove unit (301) is provided at the center of the cylindrical shaft positioning portion (3), and the oil groove unit (301) is a ladder-shaped inwardly concave structure. The rocker arm engaging portion (4) comprises an upper engaging portion (400) and a lower engaging portion (401) which are arranged in a mirror image, and a stress bearing portion (410) is fixedly provided between the upper engaging portion (400) and the lower engaging portion (401). The upper engaging portion (400) and the lower engaging portion (401) both comprise a limiting boss (402), and the outer edges of the limiting boss (402) are evenly distributed with engaging tooth blocks (403), and the engaging tooth blocks (403) are a ladder-shaped outwardly convex structure.

2. The brake cam shaft according to claim 1, characterized in that: The lubricating tank unit (301) comprises four oblique oil inlet sections (302), and an inwardly concave lubrication storage section (303) is provided at the center between the four oblique oil inlet sections (302).

3. The brake cam shaft according to claim 1, characterized in that: The stress bearing portion (410) comprises an upper bearing column (411) and a lower bearing column (412) which are arranged in a mirror image.

4. The brake cam shaft according to claim 3, characterized in that: The upper bearing column (411) is arranged to be larger at the top and smaller at the bottom from top to bottom, and the lower bearing column (412) is arranged to be smaller at the top and larger at the bottom from top to bottom.

5. The brake cam shaft according to claim 1, characterized in that: The cam portion (2) comprises a shoe clamping block (201) arranged at the upper end, and a positioning clamping ring (202) is fixedly arranged at the bottom end of the shoe clamping block (201).

6. The brake cam shaft according to claim 1, characterized in that: The rocker arm engaging portion (4) is connected to the rocker arm via an engaging tooth block (403).

7. The brake cam shaft according to claim 1, characterized in that: The cam shaft component (1) is cast from stainless steel into an integrally formed structure.

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