Steel plate spring pin shaft applied to front suspension of commercial vehicle

Abstract

The steel plate spring pin shaft applied to the front suspension of the commercial vehicle comprises a pin shaft cylinder, a first pin shaft milling groove and a second pin shaft milling groove are symmetrically formed in the two sides of the pin shaft cylinder, a first pin shaft oil channel is formed in the groove bottom of the first pin shaft milling groove, and a second pin shaft oil channel is formed in the groove bottom of the second pin shaft milling groove. The milling grooves are formed in the two sides of the pin shaft column body, the double oil channels are arranged, on the premise that it is guaranteed that the pin shaft has enough rigidity, the oil storage amount of the pin shaft is increased, the blocking risk is reduced, abrasion of the steel plate spring pin shaft in the front suspension is delayed and avoided, the structure is reasonable, lubricating grease filling is more convenient, and the lubricating effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to commercial vehicle front suspension spare part technical field especially relates to a kind of leaf spring pin shaft applied to commercial vehicle front suspension. BACKGROUND

[0002] In the front suspension system of commercial vehicle, the leaf spring pin shaft plays a key connecting role. The pin shaft is located at the front and rear ends of the leaf spring, responsible for connecting the leaf spring and the frame tightly. In this way, when the vehicle is running on different road conditions, the impact and vibration of the wheels can be effectively transmitted to the frame, thereby playing the role of guiding, carrying and damping of the suspension, ensuring the stability of vehicle control and ride comfort.

[0003] However, the traditional leaf spring pin shaft is prone to wear after long-term use. The wear debris generated by wear will accumulate in the milling groove of the pin shaft, preventing the lubricating grease from being injected normally. This blockage or wear phenomenon not only affects the normal operation of the suspension, but also makes the wear problem of the pin shaft worse due to the inability to inject lubricating grease. The vicious cycle of wear and blockage seriously affects the driving experience of users. SUMMARY

[0004] To solve the above technical problems, the utility model provides a kind of leaf spring pin shaft applied to commercial vehicle front suspension. To have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This part is not a general review, nor does it determine the key / important elements or delineate the protection scope of these embodiments. Its only purpose is to present some concepts in simple form as a prelude to the detailed description that follows.

[0005] The utility model adopts the following technical solutions:

[0006] A leaf spring pin shaft applied to commercial vehicle front suspension is provided, comprising: a pin shaft cylinder, first and second pin shaft milling grooves are symmetrically provided on both sides of the pin shaft cylinder, a first pin shaft oil channel is provided in the bottom of the first pin shaft milling groove, a second pin shaft oil channel is provided in the bottom of the second pin shaft milling groove, and both the first and second pin shaft oil channels extend to the interior of the pin shaft cylinder and are connected to the channel provided at the rear end of the pin shaft cylinder.

[0007] Further, a pin shaft rotation-stopping groove is provided on the pin shaft cylinder on both sides of the first pin shaft milling groove.

[0008] Further, the first pin shaft oil channel is provided at the middle part of the bottom of the first pin shaft milling groove, and the second pin shaft oil channel is provided at the rear half position of the bottom of the second pin shaft milling groove.

[0009] Further, the length of the pin shaft column is 155mm; the length of the first pin shaft milling groove and the second pin shaft milling groove is 68mm, and the tolerance range is +2 to 0; the distance between the first pin shaft milling groove, the second pin shaft milling groove and the front end face of the pin shaft column is 44mm, and the tolerance range is +0.6 to -0.6.

[0010] Further, the distance between the center line of the first pin shaft oil channel and the rear end face of the pin shaft column is 77.5mm, and the distance between the center line of the second pin shaft oil channel and the rear end face of the pin shaft column is 60mm.

[0011] Further, the diameter of the pin shaft column is 30mm, and the tolerance range is -0.03 to -0.07; the front end face of the pin shaft column is provided with a 30° chamfer, and the rear end face of the pin shaft column is provided with a 45° chamfer.

[0012] Further, the surface of the pin shaft column is provided with a quenching area, the quenching area covers the first pin shaft milling groove and the second pin shaft milling groove, and the distance between the two side edges of the quenching area and the front and rear end faces of the pin shaft column is 31mm, and the tolerance range is +1 to -1.

[0013] The beneficial effects brought by the utility model: the application is provided with milling grooves on both sides of the pin shaft column and is equipped with double oil channels, under the premise of ensuring that the pin shaft has sufficient rigidity, the oil storage capacity of the pin shaft is improved, the risk of blockage is reduced, and the wear of the steel plate spring pin shaft in the front suspension is delayed and avoided, and the structure is reasonable, the lubricating grease is more convenient to add, and the lubrication effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme 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, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0015] Figure 1 It is a structure schematic view of a steel plate spring pin shaft applied to a front suspension of a commercial vehicle.

[0016] Figure 2 It is the A view of Figure 1 . DETAILED DESCRIPTION

[0017] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] like Figures 1-2 As shown, in some illustrative embodiments, a leaf spring pin for use in the front suspension of a commercial vehicle is provided, comprising: a pin post 1 for connecting and supporting the leaf spring.

[0019] The pin shaft 1 has a first pin groove 2 and a second pin groove 3 symmetrically formed on both sides, thus the pin of this application has two pin grooves that together accommodate lubricating grease. A first pin oil passage 4 is formed at the bottom of the first pin groove 2, and a second pin oil passage 5 is formed at the bottom of the second pin groove 3, thus the pin of this application has two pin oil passages. Both the first pin oil passage 4 and the second pin oil passage 5 extend into the interior of the pin shaft 1 and connect with the channel 6 formed at the rear end of the pin shaft 1, forming a complete lubrication path.

[0020] In fluid mechanics, Poiseuille's law is as follows:

[0021]

[0022] Where ΔP is the pressure, η is the fluid viscosity, L is the channel length, Q is the flow rate, and r is the channel radius; according to Poiseuille's law, when the flow rate Q is constant, as the channel length L increases, the pressure ΔP increases.

[0023] Compared to ordinary leaf spring pins, this application features milled grooves and dual oil passages on both sides of the pin body 1, increasing the pin's oil capacity and improving lubrication. The increased passage length also enhances the pressure during grease filling. Even with slight wear, the oil passages remain unobstructed, preventing a vicious cycle of wear and blockage, thus ensuring adequate lubrication and facilitating easy grease filling. This design significantly improves the lubrication performance and durability of the leaf spring pin, helping to reduce maintenance costs and extend its service life.

[0024] The pin shaft body 1 has pin shaft anti-rotation grooves 7 on both sides of the first pin shaft milling groove 2. The pin shaft anti-rotation grooves 7 are mainly to prevent the pin shaft from rotating unnecessarily during installation or use, thereby maintaining the correct position of the leaf spring. At the same time, the pin shaft anti-rotation grooves 7 can provide precise positioning for the pin shaft, ensuring the correct installation and operation of the pin shaft in the suspension system.

[0025] The first pin shaft oil channel 4 is arranged at the middle part of the groove bottom of the first pin shaft milling groove 2, and the second pin shaft oil channel 5 is arranged at the rear half position of the groove bottom of the second pin shaft milling groove 3. The first pin shaft oil channel 4 is staggered with the second pin shaft oil channel 5, which can avoid reducing the rigidity of the pin shaft and optimize the length of the oil channel. The total length of the oil channel formed by the first pin shaft oil channel 4 and the channel 6 is longer than the total length of the oil channel formed by the second pin shaft oil channel 5 and the channel 6, so that different lubrication strategies can be provided according to the specific stress and wear of the pin shaft, and the longer oil channel can generate higher pressure when the lubricating grease is filled, which helps to maintain the smoothness of the oil channel when the pin shaft is worn. In addition, different oil channel positions can enhance the flowability and distribution of the lubricating grease in the pin shaft, thereby improving the overall lubrication effect.

[0026] The length L1 of the pin shaft column 1 is 155 mm; the groove length L1 of the first pin shaft milling groove 2 and the second pin shaft milling groove 3 is 68 mm, and the tolerance range is +2 to 0; the distance L3 between the first pin shaft milling groove 2, the second pin shaft milling groove 3 and the front end face of the pin shaft column 1 is 44 mm, and the tolerance range is +0.6 to -0.6.

[0027] The distance L4 between the center line of the first pin shaft oil channel 4 and the rear end face of the pin shaft column 1 is 77.5 mm, and the distance L5 between the center line of the second pin shaft oil channel 5 and the rear end face of the pin shaft column 1 is 60 mm.

[0028] The diameter D of the pin shaft column 1 is 30 mm, and the tolerance range is -0.03 to -0.07; a 30° chamfer is arranged on the front end face of the pin shaft column 1, and a 45° chamfer is arranged on the rear end face of the pin shaft column 1.

[0029] The surface of the pin shaft column 1 is provided with a quenching area 8, the quenching area 8 covers the first pin shaft milling groove 2 and the second pin shaft milling groove 3, and the distance L6 between the two side edges of the quenching area 8 and the front and rear end faces of the pin shaft column 1 is 31 mm, and the tolerance range is +1 to -1. The surface hardness of the quenching area 8 is 58-63HRC.

[0030] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A leaf spring pin shaft for use in a front suspension of a commercial vehicle, characterized in that The pin shaft column is provided with a first pin shaft milling groove and a second pin shaft milling groove symmetrically on both sides of the pin shaft column, a first pin shaft oil channel is formed in the bottom of the first pin shaft milling groove, a second pin shaft oil channel is formed in the bottom of the second pin shaft milling groove, and the first pin shaft oil channel and the second pin shaft oil channel extend to the inside of the pin shaft column and are communicated with a channel formed in the rear end of the pin shaft column. A pin shaft rotation stopping groove is formed in the pin shaft column on both sides of the first pin shaft milling groove.

2. A leaf spring pin axle for use in a front suspension of a commercial vehicle according to claim 1, characterized in that The first pin shaft oil channel is formed in the middle of the bottom of the first pin shaft milling groove, and the second pin shaft oil channel is formed in the rear half of the bottom of the second pin shaft milling groove.

3. A leaf spring pin axle for use in a front suspension of a commercial vehicle according to claim 2, characterized in that The length of the pin shaft column is 155 mm, the length of the first pin shaft milling groove and the second pin shaft milling groove is 68 mm, and the tolerance range is +2 to 0; the distance between the first pin shaft milling groove, the second pin shaft milling groove and the front end face of the pin shaft column is 44 mm, and the tolerance range is +0.6 to -0.

6.

4. A leaf spring pin axle for use in a front suspension of a commercial vehicle according to claim 3, characterized in that The distance between the center line of the first pin shaft oil channel and the rear end face of the pin shaft column is 77.5 mm, and the distance between the center line of the second pin shaft oil channel and the rear end face of the pin shaft column is 60 mm.

5. A leaf spring pin axle for use in a front suspension of a commercial vehicle according to claim 4, characterized in that The diameter of the pin shaft column is 30 mm, and the tolerance range is -0.03 to -0.07; a 30° chamfer is formed in the front end face of the pin shaft column, and a 45° chamfer is formed in the rear end face of the pin shaft column.

6. A leaf spring pin axle for use in a front suspension of a commercial vehicle according to claim 5, characterized in that The surface of the pin shaft column is provided with a quenching area, the quenching area covers the first pin shaft milling groove and the second pin shaft milling groove, and the distance between the two side edges of the quenching area and the front and rear end faces of the pin shaft column is 31 mm, and the tolerance range is +1 to -1.

7. A leaf spring pin axle for use in a front suspension of a commercial vehicle according to claim 6, characterized in that ​

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