Brake pedal assembly with oppositely-locked central shaft
The interlocking central shaft structure composed of a mother shaft and a daughter shaft solves the problems of high production cost and poor consistency of brake pedal assembly, achieving simple assembly and high consistency, and avoiding pedal jamming or looseness.
Patent Information
- Application Number
- CN202520583348.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Existing brake pedal assemblies have high production costs and poor product consistency. The locking method of the central shaft relies on manual judgment, which leads to inaccurate assembly and problems such as pedal movement being stuck or loose.
The center shaft adopts a locking type structure consisting of a mother shaft and a daughter shaft. The mother shaft and the daughter shaft are connected coaxially. The mother shaft is a hollow structure with an internal thread, and the external thread of the daughter shaft matches that of the mother shaft. Combined with the anti-loosening design, it ensures the consistency of assembly depth.
It reduces the production cost of the brake pedal assembly, simplifies the assembly process, avoids pedal jamming or looseness, and improves product consistency.
Smart Images
Figure CN223890969U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of brake pedal assembly, and in particular a brake pedal assembly with a locking center shaft. Background Technology
[0002] The brake pedal is a control device for slowing down and stopping a car, and plays a crucial role in the braking system.
[0003] For the brake pedal center shaft portion, existing technical solutions can be divided into two types: 1) such as Figure 1 As shown, the structure of Scheme 1: The existing brake pedal assembly mainly consists of three parts: pedal arm assembly 1, pedal bracket 2, and central shaft 3. The central shaft is stepped. The pedal arm assembly is connected to the pedal bracket via the stepped central shaft and locking nut 4. A bushing 5 is provided between the pedal arm assembly and the central shaft. The step of the central shaft is used for assembly limiting, thereby ensuring the opening size of the pedal assembly; 2) As... Figure 2 As shown, Option 2 adds a limiting shaft tube 6 to Option 1. The limiting shaft tube is located between the central shaft and the bushing, and the stepped central shaft is replaced with a long bolt. The stepped central shaft in Option 1 requires machining, which makes the cost of a single central shaft higher. Although Option 2 eliminates the machining of the stepped shaft, it adds a new part, the limiting shaft tube, and complicates the assembly process, so the cost of the brake pedal assembly is still high.
[0004] In addition, in existing technical solutions, the locking method of the central shaft is mostly to use locking nuts for interlocking. During the assembly process, the assembly depth of the nut on the central shaft cannot be precisely controlled. It usually relies on the operator's subjective judgment to determine whether the nut is assembled in place. Pedals produced by this assembly method often have problems such as pedal movement jamming or axial looseness, and the product consistency is also poor. Utility Model Content
[0005] This invention provides a brake pedal assembly with a locking center shaft, which reduces the manufacturing cost of the brake pedal assembly while also solving manufacturing quality problems.
[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a brake pedal assembly with a locking center shaft, including a pedal arm assembly, a pedal bracket, and a center shaft, wherein the pedal arm assembly is connected to the pedal bracket via the center shaft; characterized in that: the center shaft is composed of a female shaft and a male shaft, the female shaft and the male shaft are arranged opposite to each other on the pedal bracket, and the shaft bodies of the female shaft and the male shaft are coaxially connected; the female shaft body adopts a semi-hollow through shaft, the hollow part is designed with internal threads, the length of the male shaft body is less than the length of the hollow part of the female shaft, the male shaft body is provided with external threads that match the internal threads of the female shaft, and the length of the external thread part extends to the position of the male shaft nut.
[0007] To further specify the above technical solution, the connection between the mother shaft and the daughter shaft is made in a way that prevents loosening.
[0008] The above technical solution is further defined as follows: the length of the main shaft is equal to the sum of the thickness of the pedal bracket plate and the designed opening size.
[0009] The above technical solution is further specified as follows: the diameter of the female shaft is 13-16 mm, and the wall thickness of the hollow part is 1.5-1.8 mm;
[0010] To further specify the above technical solution, the materials of the mother shaft and the daughter shaft are #35 steel.
[0011] Beneficial effects: 1) Compared with existing solutions, this utility model has lower manufacturing costs: the through-shaft structure saves the manufacturing costs caused by the machining process of the stepped structure of the stepped center shaft; this utility model forms a natural limiting structure during assembly, which can eliminate the limiting shaft tube parts and save the manufacturing and assembly costs of the limiting shaft tube; 2) This utility model has a simpler assembly form, which can effectively solve the problem of jamming or looseness caused during pedal assembly and improve product consistency; when the male shaft and female shaft are assembled, the hollow end of the female shaft and the male shaft nut naturally form a limiting of the locking assembly depth, that is, during operation, it is only necessary to tighten the male shaft to the state where it cannot be tightened further, which objectively indicates that the male and female center shafts have been assembled in place; under the condition that the center shaft size is qualified, the pedal jamming or looseness will not occur in principle. Attached Figure Description
[0012] Figure 1 This is the first prior art structure diagram in the background technology.
[0013] Figure 2 This is the second type of prior art structure diagram in the background technology.
[0014] Figure 3 This is a structural diagram of the utility model.
[0015] Figure 4 yes Figure 3 Central axis structure diagram. Detailed Implementation
[0016] As shown in Figure 3, a brake pedal assembly with a locking center shaft includes a pedal arm assembly 1, a pedal bracket 2, and a center shaft 3. The pedal arm assembly is connected to the pedal bracket via the center shaft. The pedal bracket mainly consists of a base plate and a left bracket 201 and a right bracket 202 fixed to the base plate.
[0017] The central shaft consists of a mother shaft 301 and a son shaft 302. The mother shaft body passes through the mounting hole on the left bracket, and the mother shaft nut is limited to the outer side of the left bracket. The son shaft rod passes through the mounting hole on the right bracket, and the son shaft nut is limited to the outer side of the right bracket. The mother shaft and the son shaft are arranged opposite to each other on the pedal bracket, and the shaft bodies of the mother shaft and the son shaft are connected coaxially.
[0018] like Figure 3 and 4 As shown, the female shaft 301 is a semi-hollow through shaft, with an internal thread 303 designed in the hollow part; the length of the male shaft is less than the length of the hollow part of the female shaft, and the male shaft is provided with an external thread 304 that matches the internal thread of the female shaft. The length of the external thread extends to the nut position of the male shaft to ensure that there is no gap after the male shaft and the female shaft are assembled and tightened; the semi-hollow through shaft refers to the fact that the end face of the female shaft is provided with a blind hole;
[0019] Furthermore, the connection between the female and male shafts employs an anti-loosening design, such as anti-loosening threads or adhesive bonding; the specific method is not limited. This prevents the locking center shaft from loosening due to external impacts or vehicle vibrations, thus ensuring driving safety. Figure 3 As shown, anti-loosening adhesive 8 is provided between the female shaft and the male shaft for screws;
[0020] Furthermore, the length of the main shaft is equal to the sum of the thickness of the left and right support plates and the designed opening size (opening size: the distance between the inner sides of the left and right supports). During the design process, it is necessary to combine the axial performance requirements of the pedal and focus on controlling the length tolerance of the main shaft. When the spindle and the main shaft are assembled, the hollow part of the main shaft and the nut of the spindle naturally form a limit to the locking assembly depth. That is, during operation, the spindle only needs to be tightened to the point where it cannot be tightened any further. At this point, it objectively indicates that the main shaft and spindle are assembled in place. This can effectively avoid the pedal jamming or looseness caused by the worker's subjective judgment in the original technical solution, and also helps to ensure the consistency of the product.
[0021] Furthermore, in order to meet the strength requirements of the pedal assembly and prevent the central shaft from breaking under extreme conditions, the diameter of the female shaft is 13-16mm and the wall thickness is 1.5-1.8mm.
[0022] Furthermore, in order to reduce production costs, the material for both the mother shaft and the daughter shaft is #35 steel;
[0023] The interlocking center shaft of this invention is applicable not only to pedals with metal brackets but also to pedals with plastic brackets.
Claims
1. A brake pedal assembly with a locking central shaft, comprising a pedal arm assembly, a pedal bracket, and a central shaft, wherein the pedal arm assembly is connected to the pedal bracket via the central shaft; characterized in that: The central shaft consists of a female shaft and a male shaft, which are arranged opposite each other on the pedal bracket. The shaft bodies of the female shaft and the male shaft are connected coaxially. The female shaft body adopts a semi-hollow through shaft, and the hollow part is designed with internal threads. The length of the male shaft body is less than the length of the hollow part of the female shaft. The male shaft body is provided with external threads that match the internal threads of the female shaft, and the length of the external thread part extends to the position of the male shaft nut.
2. The brake pedal assembly with a locking center shaft according to claim 1, characterized in that: The connection between the main shaft and the secondary shaft is made using an anti-loosening method.
3. A brake pedal assembly with a locking center shaft according to claim 1 or 2, characterized in that: The length of the main shaft is equal to the sum of the thickness of the pedal bracket plate and the designed opening size.
4. The brake pedal assembly with a locking center shaft according to claim 3, characterized in that: The diameter of the female shaft is 13-16 mm, and the wall thickness of the hollow part is 1.5-1.8 mm.
5. A brake pedal assembly with a locking center shaft according to claim 1, 2, or 4, characterized in that: The material of the main shaft and the slave shaft is #35 steel.