Plate spring pin shaft and vehicle

Abstract

The utility model discloses a plate spring pin shaft and a vehicle, and belongs to the field of vehicle accessories. According to the technical scheme, the plate spring pin shaft comprises a sleeve and a shaft body, internal threads are arranged on the inner surface of the sleeve, front-section external threads and rear-section external threads are arranged on the outer surface of the shaft body, an optical shaft section is arranged between the front-section external threads and the rear-section external threads, an oil injection opening is formed in one end of the shaft body, an oil outlet hole is formed in the outer surface of the optical shaft section, and the oil outlet hole is communicated with the oil injection opening. The front-section external thread and the rear-section external thread are both connected with the internal thread, and gaps are formed between the front-section external thread and the internal thread and between the rear-section external thread and the internal thread. According to the plate spring pin shaft, the shaft body and the sleeve are of a threaded connection structure, and the gaps are formed between the threads, so that on one hand, the contact area can be remarkably increased, stress concentration is reduced, and the service life is greatly prolonged; and on the other hand, lubricating grease can be uniformly distributed in the sleeve, the lubricating effect is remarkably improved, the structural design is reasonable, the assembly process is simple, and the working efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts, and in particular to a leaf spring pin and a vehicle. Background Technology

[0002] Leaf spring shock absorbers are a traditional type of shock absorption in automotive suspension systems. Their main function is to bear the weight of the vehicle body and load, while absorbing and cushioning impacts from uneven road surfaces, ensuring a smooth ride and passenger comfort. Structurally, a leaf spring consists of multiple steel plates of unequal length stacked together, fixed to the axle in the middle and connected to the frame at both ends. The working principle of a leaf spring shock absorber mainly involves elastic deformation and frictional damping. When a car travels on uneven roads, the leaf springs bend and deform, absorbing some energy and thus damping the vibration. During deformation, the leaf springs slide relative to each other, dissipating some energy through friction, thereby reducing vibration. The advantages of leaf spring shock absorbers include simple structure, low manufacturing and maintenance costs, high load-bearing capacity, and long service life.

[0003] The leaf spring pin connects the leaf spring end lug to the frame. During vehicle operation, the leaf spring deforms to provide cushioning. As a connection point, the pin is prone to loosening of parts and failure due to wear.

[0004] Current pin structures generally consist of a cylindrical body and an outer sleeve. The cylindrical body is inserted into the sleeve, which is connected to a lug. Both ends of the body are connected to leaf spring seats on the frame. During vehicle vibration, a certain degree of relative rotation occurs between the cylindrical body and the sleeve. To improve the pin's lifespan, the pin body usually has an oil inlet channel to inject lubricating oil between the pin body and the sleeve. However, due to the tight fit between the pin body and the sleeve, and the fact that they become flush after prolonged use, lubricating oil injection is difficult due to pressure. Furthermore, installation and disassembly are challenging, resulting in limited effectiveness, increased wear, and a shortened lifespan. After vehicle assembly, the limited space makes maintenance and replacement of parts extremely inconvenient. Summary of the Invention

[0005] This invention addresses the problem of inconvenient oiling between the cylindrical body and sleeve of current leaf spring pins, which affects their service life, by providing a leaf spring pin that is easier to oil.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows: a leaf spring pin shaft, including a sleeve and a shaft body. The inner surface of the sleeve is provided with an internal thread, and the outer surface of the shaft body is provided with a front external thread and a rear external thread. A smooth shaft section is provided between the front external thread and the rear external thread. The diameter of the smooth shaft section is smaller than the major diameter of the front external thread and the rear external thread. An oil passage is provided in the shaft body, and an oil inlet of the oil passage is provided at one end of the shaft body. An oil outlet hole of the oil passage is provided on the outer surface of the smooth shaft section. Both the front external thread and the rear external thread are connected to the internal thread, and there is a gap between the front external thread, the rear external thread and the internal thread. The leaf spring pin shaft provided in this solution adopts a threaded connection structure between the shaft body and the sleeve, and a gap is set between the threads. On the one hand, this can significantly increase the contact area and reduce stress concentration, thereby greatly improving the service life. On the other hand, it can ensure that the injection and flow of grease has space and direction, and is evenly distributed in the sleeve, significantly improving the lubrication effect. The structure is reasonably designed, the assembly process is simple, and the working efficiency is high.

[0007] In a preferred embodiment of a leaf spring pin, the tooth tip of the internal thread is a planar structure, and the gap is formed between the tooth tip plane of the internal thread and the tooth root of the front external thread and the rear external thread.

[0008] In a preferred embodiment of a leaf spring pin, the tooth tips of the front and rear external threads are planar structures, and the gap is formed between the tooth tip planes of the front and rear external threads and the tooth root of the internal thread. The gap is formed by the fit of the thread shape itself, which is simple to manufacture, easy to assemble, and provides good gap retention, making it less susceptible to compression deformation.

[0009] In a preferred embodiment of a leaf spring pin, both ends of the shaft extend outward relative to the ends of the sleeve. O-rings are respectively provided at the two ends of the shaft outside the sleeve, with each O-ring abutting against the end faces of the sleeve. The O-rings at both ends of the sleeve serve two purposes: firstly, they isolate the lubricating grease from the external environment, preventing contaminants from entering the sleeve; secondly, when the lubricating grease is full, it squeezes the O-rings, causing them to deform and allowing a small amount of grease to flow out, thus allowing observation of the grease filling status.

[0010] In a preferred embodiment of the leaf spring pin, a positioning part is provided at one end of the shaft body located outside the sleeve. The diameter of the positioning part is larger than the diameter of the shaft body, and a positioning groove is formed on the positioning part, which surrounds the positioning part. With the positioning part provided, the leaf spring pin is securely connected to the frame after installation via the positioning part and the positioning groove, ensuring a firm installation and positioning.

[0011] In a preferred embodiment of the leaf spring pin, an oil drain groove is provided on the positioning part, located on one end face of the positioning part near the sleeve. After the lubricating grease is filled, it presses against the O-ring and flows out through the oil drain groove.

[0012] In a preferred embodiment of the leaf spring pin, the positioning part is further provided with a retaining clip, which is located at the end of the positioning part away from the sleeve. This facilitates the screwing-in installation of the shaft.

[0013] In a preferred embodiment of a leaf spring pin, the axial lengths of the front and rear external threads are greater than the axial length of the smooth shaft section. This ensures the length of the threaded connection, thereby guaranteeing the connection strength between the shaft and the sleeve.

[0014] In a preferred embodiment of the leaf spring pin, the shaft body is provided with an annular groove for the O-ring to be inserted. The O-ring is not easily dislodged from its mounting position, ensuring the sealing of the gap between the shaft body and the sleeve.

[0015] On the other hand, this utility model also provides a vehicle that uses the aforementioned leaf spring pin. The leaf spring pin of this vehicle has good lubrication performance, the shock absorption system is not easily worn, and it has a long service life.

[0016] As can be seen from the above technical solutions, the advantages of this utility model are as follows: The O-ring and oil drain groove structure: On the one hand, it isolates the lubricating grease from the external environment, ensuring that external contaminants cannot enter the sleeve; on the other hand, when the lubricating grease is full, it squeezes the O-ring, causing it to deform, and a small amount of lubricating grease flows out along the oil drain groove, allowing observation of the grease filling status. The threaded fit structure: On the one hand, it significantly increases the contact area and reduces stress concentration, thereby greatly improving service life; on the other hand, it ensures that the grease is directional and evenly distributed within the sleeve, significantly improving the lubrication effect. This structure is rationally designed, has a simple assembly process, and high working efficiency; it can maximize lubrication efficiency and allow observation of the lubricating grease injection situation. The overall structure is simple and reliable, and the lubrication effect is good.

[0017] This pin structure is designed with practicality and efficiency in mind, resulting in a rational and efficient overall structure. During assembly, its simple process significantly improves work efficiency and reduces production costs. In particular, the fit between the oil drain groove and the O-ring at the flange not only provides a good seal but also serves as an important indicator of whether the lubricating grease is full. This ingenious and practical design makes maintenance more convenient and ensures the safety of the equipment during operation. Furthermore, the threaded fit design increases the contact area, effectively reducing stress concentration and allowing the pin structure to remain stable under heavy loads. This structure not only extends the service life of the pin but also reduces the equipment failure rate, creating greater economic benefits for the company. In summary, this pin structure ensures performance while also balancing ease of operation and stability. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional schematic diagram of Embodiment 1 of the present utility model.

[0020] Figure 2 This is a schematic diagram of the shaft structure in Embodiment 1 of this utility model. Figure 1 .

[0021] Figure 3 This is a schematic diagram of the shaft structure in Embodiment 1 of this utility model. Figure 2 .

[0022] Explanation of main figure symbols

[0023] 1. Positioning groove, 2. Oil unloading groove, 3. Sleeve, 4. O-ring, 5. Oil outlet hole, 6. Injection port, 7. Shaft body, 8. Snap square. Detailed Implementation

[0024] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0025] Example 1

[0026] A leaf spring pin includes a sleeve 3 and a shaft 7. The inner surface of the sleeve 3 is provided with an internal thread, and the outer surface of the shaft 7 is provided with a front external thread and a rear external thread. A smooth shaft section is provided between the front external thread and the rear external thread, and the diameter of the smooth shaft section is smaller than the major diameter of the front external thread and the rear external thread. An oil passage is provided in the shaft 7, and an oil inlet 6 of the oil passage is provided at one end of the shaft 7. An oil outlet hole 5 of the oil passage is provided on the outer surface of the smooth shaft section. Both the front external thread and the rear external thread are connected to the internal thread, and there is a gap between the front external thread, the rear external thread and the internal thread. The tooth tip of the internal thread has a planar structure, and the gap is formed between the tooth tip plane of the internal thread and the tooth root of the front external thread and the rear external thread. The leaf spring pin shaft and the sleeve adopt a threaded connection structure, and a gap is set between the threads. On the one hand, this can significantly increase the contact area and reduce stress concentration, thereby greatly improving the service life. On the other hand, it can ensure that the grease injection and flow have space and direction, and is evenly distributed in the sleeve, significantly improving the lubrication effect. This structure is reasonably designed, the assembly process is simple, and the working efficiency is high.

[0027] Both ends of the shaft 7 extend outward relative to the two ends of the sleeve 3. O-rings 4 are respectively provided at the two ends of the shaft 7 outside the sleeve 3, and the two O-rings abut against the end faces of the sleeve. The shaft 7 has annular grooves for the O-rings to engage. A positioning part is provided at one end of the shaft 7 outside the sleeve 3. The diameter of the positioning part is larger than the diameter of the shaft 7. A positioning groove 1 is formed on the positioning part, surrounding it. An oil drain groove 2 is formed on the positioning part, located on the side of the positioning part closer to the end face of the sleeve 3. A retaining block 8 is also provided on the positioning part, located at the end of the positioning part away from the sleeve 3. The axial length of the front external thread and the rear external thread is greater than the axial length of the optical shaft section.

[0028] Example 2

[0029] This embodiment is basically the same in structure as Embodiment 1, both including a sleeve 3 and a shaft 7. The inner surface of the sleeve 3 is provided with an internal thread, and the outer surface of the shaft 7 is provided with a front external thread and a rear external thread. There is a smooth shaft section between the front external thread and the rear external thread. The diameter of the smooth shaft section is smaller than the major diameter of the front external thread and the rear external thread. An oil passage is provided in the shaft 7, and an oil inlet 6 of the oil passage is provided at one end of the shaft 7. An oil outlet hole 5 of the oil passage is provided on the outer surface of the smooth shaft section. Both the front external thread and the rear external thread are connected to the internal thread, and there is a gap between the front external thread, the rear external thread and the internal thread. The two ends of the shaft 7 extend outward relative to the two ends of the sleeve 3. O-rings 4 are respectively provided at the two ends of the shaft 7 outside the sleeve 3. The two O-rings are respectively abutted against the end faces of the two ends of the sleeve. The shaft 7 is provided with annular grooves for the O-rings to be inserted. O-rings are installed at both ends of the sleeve. This serves two purposes: firstly, it isolates the lubricating grease from the external environment, preventing contaminants from entering the sleeve; secondly, when the lubricating grease is full, it squeezes the O-rings, causing them to deform and allowing a small amount of grease to flow out, thus allowing observation of the grease filling status. A positioning part is provided at one end of the shaft 7 outside the sleeve 3. The diameter of the positioning part is larger than the diameter of the shaft 7. A positioning groove 1 is formed on the positioning part, surrounding it. An oil drain groove 2 is also provided on the positioning part, located on the side of the positioning part closest to the end face of the sleeve 3. A retaining block 8 is also provided on the positioning part, located at the end of the positioning part away from the sleeve 3. The axial length of the front and rear external threads is greater than the axial length of the smooth shaft section.

[0030] Unlike Embodiment 1, in this embodiment, the tooth tips of the front external thread and the rear external thread are planar structures, and the gap is formed between the tooth tip planes of the front external thread and the rear external thread and the tooth root of the internal thread.

[0031] Example 3

[0032] This embodiment further provides a vehicle that uses the leaf spring pin provided in Embodiment 1 or Embodiment 2, with the sleeve connected to the leaf spring's coil lug, and both ends of the shaft connected to the leaf spring seats of the vehicle frame.

[0033] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: The O-ring and oil drain groove structure: on the one hand, it can isolate the lubricating grease from the external environment, ensuring that external contaminants cannot enter the sleeve; on the other hand, when the lubricating grease is full, it will squeeze the O-ring, causing the O-ring to deform, and a small amount of lubricating grease will flow out along the oil drain groove, which can be used to observe the grease filling status. The threaded fit structure: on the one hand, it can significantly increase the contact area and reduce stress concentration, thereby greatly improving the service life; on the other hand, it can ensure that the lubricating grease is directional and evenly distributed in the sleeve, significantly improving the lubrication effect. This structure is reasonably designed, the assembly process is simple, and the working efficiency is high; it can maximize the lubrication efficiency and observe the injection of lubricating grease. The overall structure is simple and reliable, and the lubrication effect is good.

[0034] This pin structure is designed with practicality and efficiency in mind, resulting in a rational and efficient overall structure. During assembly, its simple process significantly improves work efficiency and reduces production costs. In particular, the fit between the oil drain groove and the O-ring at the flange not only provides a good seal but also serves as an important indicator of whether the lubricating grease is full. This ingenious and practical design makes maintenance more convenient and ensures the safety of the equipment during operation. Furthermore, the threaded fit design increases the contact area, effectively reducing stress concentration and allowing the pin structure to remain stable under heavy loads. This structure not only extends the service life of the pin but also reduces the equipment failure rate, creating greater economic benefits for the company. In summary, this pin structure ensures performance while also balancing ease of operation and stability.

[0035] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A leaf spring pin, comprising a sleeve (3) and a shaft (7), characterized in that, The inner surface of the sleeve (3) is provided with an internal thread, and the outer surface of the shaft (7) is provided with a front external thread and a rear external thread. There is a smooth shaft section between the front external thread and the rear external thread. The diameter of the smooth shaft section is smaller than the major diameter of the front external thread and the rear external thread. There is an oil passage in the shaft (7). One end of the shaft (7) is provided with an oil inlet (6) of the oil passage. The outer surface of the smooth shaft section is provided with an oil outlet (5) of the oil passage. The front external thread and the rear external thread are both connected to the internal thread. There is a gap between the front external thread and the rear external thread and the internal thread.

2. The leaf spring pin according to claim 1, characterized in that, The tip of the internal thread is a planar structure, and the gap is formed between the tip plane of the internal thread and the root of the front external thread and the rear external thread.

3. The leaf spring pin according to claim 1, characterized in that, The tooth tips of the front external thread and the rear external thread are planar structures, and the gap is formed between the tooth tip plane of the front external thread and the tooth root of the internal thread.

4. The leaf spring pin according to claim 1, characterized in that, The two ends of the shaft (7) extend outward relative to the two ends of the sleeve (3). O-rings (4) are provided at the two ends of the shaft (7) located outside the sleeve (3), and the two O-rings are respectively attached to the end faces of the two ends of the sleeve.

5. The leaf spring pin according to claim 4, characterized in that, The shaft (7) is provided with a positioning part at one end outside the sleeve (3). The diameter of the positioning part is larger than the diameter of the shaft (7). A positioning groove (1) is provided on the positioning part, and the positioning groove (1) is arranged around the positioning part (1).

6. The leaf spring pin according to claim 5, characterized in that, The positioning part is provided with an oil unloading groove (2), which is located on one side of the positioning part near the end face of the sleeve (3).

7. The leaf spring pin according to claim 5, characterized in that, The positioning part is also provided with a locking square (8), which is located at the end of the positioning part away from the sleeve (3).

8. The leaf spring pin according to any one of claims 1-7, characterized in that, The axial length of the front external thread and the rear external thread is greater than the axial length of the optical axis segment.

9. The leaf spring pin according to claim 4, characterized in that, The shaft (7) is provided with an annular groove for the O-ring to be inserted.

10. A vehicle, characterized in that, The leaf spring pin as described in any one of claims 1-9 is used.

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