Connecting structure of cam shaft and rocker arm of brake

Abstract

The utility model relates to the technical field of brake accessories, and discloses a connecting structure of a cam shaft and a rocker arm of a brake, which comprises a cam shaft arranged in a mounting hole of a brake box component in a penetrating manner and the rocker arm fixed on one side of the brake box component in a matching manner with one end of the cam shaft, and the other end of the cam shaft is propped against a brake opening and closing end of a shoe block group. A limiting mistake-proof mechanism is arranged between the cam shaft and the rocker arm in a matched mode and comprises a limiting connecting hole formed in one end of the rocker arm and an anti-rotation boss arranged on the cam shaft and matched with the limiting connecting hole. The problems that the rotation torque borne by tooth-to-tooth connection fit between a rocker arm and a cam shaft of an existing brake is small, contact teeth are prone to deformation or damage under the action of reverse impact force due to braking reaction force in the braking process, and safe driving is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of brake accessories, in particular to a connection structure between a brake camshaft and a rocker arm. Background Art

[0002] The brakes used on existing bicycles or electric scooters are generally hub brakes or expansion brakes. During braking, the camshaft is rotated by the rocker arm, causing the brake shoe assembly to rotate and open around the camshaft to achieve the braking effect. The connection structure between the camshaft and the rocker arm is an important matching structure. For example, CN114294352A discloses a sealed and waterproof safety drum brake, which transmits braking torque by providing adaptive transmission teeth on the rocker arm and camshaft. However, due to structural limitations, the tooth shape and size of this matching transmission structure are limited, so the contact bearing force between the teeth is limited, and the rotational torque it can withstand is also small. The braking reaction force during braking can easily cause the contact teeth to be deformed or damaged under the reverse impact, or even worn flat. Ultimately, the shoe cannot be pushed to open for braking, causing safety accidents during the operation of the electric vehicle.

[0003] With the improvement of modern manufacturing technology and the increasing braking requirements of national standard vehicles, the automated assembly and mechanical properties of product components must meet actual needs. Therefore, a reliable and practical connection method is urgently needed that can adapt to modern production and customer needs. Utility Model Content

[0004] To address the shortcomings of existing technologies, the present invention provides a connection structure between a brake camshaft and a rocker arm. This structure not only meets the increased torque requirements of brake transmissions and effectively prevents damage due to impact, but also facilitates rapid assembly, improves connection precision, eliminates gaps in the connection, and meets the needs of modern automated assembly. This solves the problem that the existing tooth-to-tooth connection between the brake rocker arm and camshaft can withstand low rotational torque, and the braking reaction force during braking can easily cause the contact teeth to deform or be damaged under the reverse impact force, thus affecting safe driving.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions.

[0006] The utility model is a connection structure between a brake camshaft and a rocker arm, comprising a camshaft inserted into a mounting hole of a brake box assembly and a rocker arm adapted to be fixed to one side of the brake box assembly with one end of the camshaft, the other end of the camshaft abutting against the brake opening and closing end of a shoe assembly, a position limiting and anti-error mechanism is provided between the camshaft and the rocker arm, the position limiting and anti-error mechanism comprising: a position limiting connection hole provided at one end of the rocker arm and an anti-rotation boss provided on the camshaft and adapted to the position limiting connection hole.

[0007] Further improvements are: the camshaft includes: a coaxially arranged pivot part and a connecting part and a cam toggle part respectively arranged on both sides of the pivot part, the cam toggle part is adapted to be clamped with one end of the shoe group, the anti-rotation boss is arranged between the pivot part and the connecting part, the connecting part is provided with a connecting thread, and the anti-rotation boss is composed of one or more anti-misalignment positioning parts and one or more toggle force transmission parts connected to each other.

[0008] A further improvement is that the maximum outer diameter of the anti-rotation boss is smaller than the outer diameter of the pivoting portion and larger than the maximum outer diameter of the connecting portion.

[0009] A further improvement is that the anti-rotation boss is provided with a plurality of anti-error positioning parts and a plurality of driving force transmission parts connected with each other in a center-symmetrical manner at intervals.

[0010] A further improvement is that the anti-rotation boss is provided by a misalignment-proof positioning portion and a plurality of driving force transmission portions which are centrally symmetrically connected.

[0011] A further improvement is that the anti-error positioning portion is configured as a tooth structure or a spline structure, and the toggle force transmission portion is configured as a planar structure connected to the tooth structure or the spline structure.

[0012] A further improvement is that the camshaft also includes a fixed base arranged between the cam shifting part and the pivoting part, the fixed base is a circular structure and is coaxially arranged with the pivoting part, and the cross-section of the cam shifting part is set as a centrally symmetrical oblong structure or a semicircular structure.

[0013] Further improvements are: the limiting connection hole is arranged at one end of the rocker arm, and the other end of the rocker arm is also provided with a parallel bending reinforcement part, the bending reinforcement part and the rocker arm are provided with a through brake line mounting hole, and the limiting connection hole is provided with an anti-error positioning part and a toggle force transmission part adapted to the anti-rotation boss.

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

[0015] 1. By setting limit error prevention mechanisms on the camshaft and rocker arm, the assembly efficiency is improved and the needs of automated production are met;

[0016] 2. By providing a position-limiting and anti-error mechanism consisting of an anti-error positioning portion and a toggle force transmission portion interconnected on the camshaft and rocker arm, and by setting the toggle force transmission portion as a flat structure, the rocker arm and camshaft are prevented from slipping during braking, sufficient torque is provided, and braking safety is ensured. At the same time, the anti-error positioning portion is effectively prevented from being damaged or deformed by large braking impacts. The anti-error positioning portion is configured as a toothed structure or a spline structure to improve the connection accuracy of the camshaft and rocker arm, eliminate connection gaps, and ensure transmission reliability.

[0017] 3. The toothed structure also prevents the camshaft and the rocker arm from generating a movement gap during the operation process, making the connection more stable, firm and reliable. At the same time, there is no need to constantly change or adjust the rocker arm assembly direction or angle during assembly, thereby improving assembly efficiency and having a good error prevention and correction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional explosion structure of the utility model.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the camshaft of the utility model.

[0020] Figure 3 It is a top view of the camshaft of the present utility model.

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the rocker arm of the utility model.

[0022] Figure 5 It is a schematic diagram of another embodiment of the present invention.

[0023] Figure ID:

[0024] 1-brake box assembly, 2-shoe group, 3-camshaft, 4-rocker arm, 5-limiting and anti-error mechanism, 51-limiting connecting hole, 52-anti-rotation boss, 53-anti-error positioning part, 54-shifting force transmission part, 31-pivoting part, 32-connecting part, 33-cam shifting part, 34-fixed base, 41-parallel bending reinforcement part, 42-brake line mounting hole. DETAILED DESCRIPTION

[0025] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. This embodiment is only used to explain the present invention and does not constitute a limitation on the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "center", "up", "down", "front", "back", "left", and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and therefore cannot be understood as limiting the present invention.

[0027] The present invention will be further described below with reference to the accompanying drawings and in combination with embodiments.

[0028] Figure 1-4The figure shows a connection structure of a brake camshaft and a rocker arm, comprising a camshaft 3 inserted into the mounting hole of a gate box assembly 1 and a rocker arm 4 adapted to be fixed to one side of the gate box assembly 1 with one end of the camshaft 3, the other end of the camshaft 3 abuts against the brake opening and closing end of the shoe group 2, and a position limiting and anti-error prevention mechanism 5 is provided between the camshaft 3 and the rocker arm 4, the position limiting and anti-error prevention mechanism 5 comprises: a position limiting connection hole 51 provided at one end of the rocker arm 4 and an anti-rotation boss 52 provided on the camshaft 3 and adapted to the position limiting connection hole 51; the camshaft 3 comprises: a coaxially arranged pivot portion 31 and a connecting portion 32 and a cam toggle portion 33 respectively arranged on both sides of the pivot portion 31, the cam toggle portion 33 is adapted to be clamped with one end of the shoe group 2, the anti-rotation boss 52 is provided between the pivot portion 31 and the connecting portion 32, and the connection A connecting thread is provided on the connecting part 32, and the anti-rotation boss 52 is composed of one or more anti-error positioning parts 53 and one or more toggle force transmission parts 54 connected to each other; the maximum outer diameter of the anti-rotation boss 52 is smaller than the outer diameter of the pivot part 31 and larger than the maximum outer diameter of the connecting part 32; the anti-rotation boss 52 is composed of multiple anti-error positioning parts 53 and multiple toggle force transmission parts 54, which are symmetrically arranged at intervals between the centers, and preferably: two anti-error positioning parts 53 and two toggle force transmission parts 54 are symmetrically arranged; the anti-error positioning part 53 is set as a tooth structure or a spline structure, and the toggle force transmission part 54 is set as a planar structure connected to the tooth structure or the spline structure; the limiting connecting hole 51 is set at one end of the rocker arm 4, and the limiting connecting hole 51 is provided with an anti-error positioning part 53 and a toggle force transmission part 54 adapted to the anti-rotation boss 52. By arranging a limit error prevention mechanism 5 consisting of an anti-error positioning part 53 and a toggle force transmission part 54 connected to each other on the camshaft and the rocker arm, and by setting the toggle force transmission part 54 as a planar structure, it is ensured that the rocker arm and the camshaft will not slip during the braking process, providing sufficient torque, ensuring the safety of braking, and effectively preventing the anti-error positioning part 53 from being damaged or deformed by a large braking impact; setting the anti-error positioning part 53 as a tooth structure or a spline structure improves the connection accuracy of the camshaft and the rocker arm, eliminates the connection gap, and ensures the reliability of the transmission; improves assembly efficiency and adapts to the needs of automated production.

[0029] An optional implementation method, such as Figure 5 As shown, the anti-rotation boss 52 is provided with an anti-error positioning portion 53 and a plurality of driving force transmission portions 54 connected symmetrically with respect to the center.

[0030] An optional implementation method, such as Figure 1-3 As shown, the camshaft 3 also includes a fixed base 34 arranged between the cam shifting portion 33 and the pivoting portion 31. The fixed base 34 is a circular structure coaxially arranged with the pivoting portion 31. The cross-section of the cam shifting portion 33 is a centrally symmetrical oblong structure or a semicircular structure.

[0031] An optional implementation method, such as Figure 1 、 4As shown, the other end of the rocker arm 4 is further provided with a parallel bent reinforcement portion 41. A brake cable mounting hole 42 extends through the bent reinforcement portion 41 and the rocker arm 4. A position-limiting connection hole 51 is provided with an anti-error positioning portion 53 and a toggle force transmission portion 54 that mate with the anti-rotation boss 52. This tooth-like structure effectively prevents play between the camshaft and the rocker arm during braking, ensuring a more stable and reliable connection. Furthermore, during assembly, there's no need to constantly adjust the rocker arm's assembly direction and angle; direct alignment allows for improved assembly efficiency and robust error prevention and correction.

[0032] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A connection structure between a brake camshaft and a rocker arm, comprising: A camshaft (3) is inserted into the mounting hole of the gate box assembly (1), and a rocker arm (4) is adapted to be fixed to one side of the gate box assembly (1) with one end of the camshaft (3), and the other end of the camshaft (3) abuts against the brake opening and closing end of the shoe assembly (2). The invention is characterized in that a position-limiting and anti-error mechanism (5) is provided between the camshaft (3) and the rocker arm (4), and the position-limiting and anti-error mechanism (5) comprises: a position-limiting connection hole (51) provided at one end of the rocker arm (4) and an anti-rotation boss (52) provided on the camshaft (3) and adapted to the position-limiting connection hole (51).

2. The connection structure according to claim 1, wherein: The camshaft (3) comprises: a coaxially arranged pivot portion (31) and a connecting portion (32) and a cam toggle portion (33) respectively arranged on both sides of the pivot portion (31); the cam toggle portion (33) is adapted to be clamped with one end of the shoe assembly (2); the anti-rotation boss (52) is arranged between the pivot portion (31) and the connecting portion (32); the connecting portion (32) is provided with a connecting thread; the anti-rotation boss (52) is composed of one or more anti-misalignment positioning portions (53) and one or more toggle force transmission portions (54) connected to each other.

3. The connection structure according to claim 2, wherein: The maximum outer diameter of the anti-rotation boss (52) is smaller than the outer diameter of the pivot portion (31) and larger than the maximum outer diameter of the connecting portion (32).

4. The connection structure according to claim 2, wherein: The anti-rotation boss (52) is provided by connecting a plurality of anti-error positioning portions (53) and a plurality of driving force transmission portions (54) at intervals and in a center-symmetrical manner.

5. The connection structure according to claim 2, wherein: The anti-rotation boss (52) is provided by a misalignment prevention positioning portion (53) and a plurality of driving force transmission portions (54) connected symmetrically to the center.

6. The connection structure according to claim 2, characterized in that: The anti-error positioning portion (53) is configured as a tooth-shaped structure or a spline structure, and the toggle force transmission portion (54) is configured as a planar structure connected to the tooth-shaped structure or the spline structure.

7. The connection structure according to any one of claims 1 to 6, characterized in that: The camshaft (3) further comprises a fixed base (34) arranged between the cam shifting portion (33) and the pivoting portion (31); the fixed base (34) is a circular structure coaxially arranged with the pivoting portion (31); and the cross section of the cam shifting portion (33) is a centrally symmetrical oblong structure or a semicircular structure.

8. The connection structure according to claim 7, characterized in that: The limiting connection hole (51) is provided at one end of the rocker arm (4), and the other end of the rocker arm (4) is further provided with a parallel bending reinforcement portion (41). A brake line mounting hole (42) is provided through the bending reinforcement portion (41) and the rocker arm (4). The limiting connection hole (51) is provided with an anti-misalignment positioning portion (53) and a toggle force transmission portion (54) adapted to the anti-rotation boss (52).

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