Primary and secondary plate spring without spring eye

Abstract

The utility model discloses a spring eye-free main and auxiliary plate spring which comprises a main spring, an auxiliary spring and a center bolt, the main spring comprises a connecting steel sheet and a plurality of main steel sheets, the auxiliary spring is connected to the inner arc side of the main spring, the auxiliary spring comprises a plurality of auxiliary steel sheets overlapped together, and the main spring and the auxiliary spring are connected and fixed through the center bolt; the center bolt comprises an end head and a rod body which are integrally formed, the rod body comprises a polished rod part and a threaded part, the polished rod part penetrates through the centers of the main spring and the auxiliary spring, and the threaded part penetrates out of the main spring and the auxiliary spring and is in threaded connection with a locking nut; an oil inlet blind hole is formed in the center bolt, a plurality of through holes are formed in the polish rod part, the through holes are communicated with the oil inlet blind hole, the through holes are distributed in the axial direction of the polish rod part, and the through holes correspond to the combination positions of the steel sheets. The utility model has the advantages of higher integral strength, strong loading capacity and lateral supporting force, high space utilization rate, convenience in addition of lubricant, sufficient lubrication among the steel sheets, small abrasion and long service life.

Description

Technical Field

[0001] The utility model relates to the technical field of leaf springs, in particular to a primary and secondary leaf spring without curling ears. Background Art

[0002] Leaf springs, also known as leaf springs, are a widely used elastic element in vehicle suspensions. Composed of several alloy spring leaves of equal width and varying lengths, they form a nearly uniformly strong elastic beam. They withstand and transmit vertical forces between the vehicle frame and axle, as well as various forces other than vertical forces and the resulting torque, ensuring smooth ride and handling stability. Lugless leaf springs are a type of leaf spring structure that, compared to traditional lug-equipped leaf springs, eliminate the lugs typically found at each end. Instead, they typically feature flat or specially shaped ends, connected to the vehicle frame, axle, and other components through novel connection methods.

[0003] During operation, leaf springs experience relative sliding and friction between their leaves. Proper lubrication can effectively reduce this friction, minimize wear, and extend the life of the leaf spring. It can also reduce noise caused by friction, helping to ensure a smooth and comfortable ride. Grease or lubricant is primarily used to lubricate the leaves. Refilling the lubricant requires using a grease gun, starting at one end of the leaf spring and slowly moving the gun along each gap, filling each gap evenly. This operation is very tedious, especially for leaf springs with multiple overlapping leaves. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a main and auxiliary leaf spring without ear curling, which has high overall strength, strong load capacity and lateral support force, high space utilization, and is easy to add lubricant. The steel sheets are fully lubricated and have little wear.

[0005] In order to achieve the above-mentioned object, the utility model provides a main-auxiliary leaf spring without curling ears, comprising a main spring, an auxiliary spring and a central bolt, wherein the main spring comprises a connecting steel sheet and a plurality of main steel sheets attached to the outer arc surface of the connecting steel sheet, wherein the length of the main steel sheet decreases in a direction away from the connecting steel sheet; the auxiliary spring is connected to the inner arc side of the main spring, wherein the auxiliary spring comprises a plurality of auxiliary steel sheets stacked together, wherein the length of the auxiliary steel sheets increases in a direction away from the connecting steel sheet;

[0006] The main spring and the auxiliary spring are connected and fixed by a central bolt; the central bolt includes an integrally formed end and a rod body, the rod body includes a smooth rod portion and a threaded portion, the smooth rod portion is arranged through the center of the main spring and the auxiliary spring, the threaded portion passes through the main spring and the auxiliary spring and is threadedly connected to a locking nut;

[0007] An oil inlet blind hole is formed in the center bolt, one end of the oil inlet blind hole passes through the end head to form an oil inlet, a plurality of through holes are opened on the polished rod part, the through holes are connected to the oil inlet blind hole, and the plurality of through holes are arranged axially along the polished rod part, and the through holes correspond to the joints of each steel sheet.

[0008] Furthermore, a lubricating oil circuit is provided on the joint surface of the relatively shorter steel sheet among the two mutually bonded steel sheets in the main and sub-leaf springs without ear, and the lubricating oil circuit includes a main oil line and several longitudinal oil lines perpendicular to the main oil line. A circular oil groove is provided on the outer edge of the central through hole of each steel sheet, and the oil groove corresponds to the through hole, and the main oil line is connected to the oil groove.

[0009] Furthermore, the groove width of the main oil line and the longitudinal oil line is 1mm-3mm, and the groove depth is 0.5-2mm.

[0010] Furthermore, the end head is cylindrical, a thread is formed on the outer peripheral surface of the end head, and the end head is threadedly connected to an oil cap, and the oil cap is used to close the oil inlet.

[0011] Furthermore, at least two connecting steel sheets are provided, and flat connection parts are formed at both ends of the connecting steel sheet, and a bending part is formed at the flat connection part of the connecting steel sheet close to the main steel sheet.

[0012] Beneficial effects of the utility model:

[0013] 1. The earless main and auxiliary leaf springs of this utility model are made of multiple laminated spring leaves, which have high overall strength and can bear large weights and loads. When fully loaded with cargo or driving on complex roads, they can maintain good support performance and ensure the normal driving and operation safety of the vehicle.

[0014] 2. The main and auxiliary leaf spring structure provides strong lateral support for the vehicle, effectively reducing body roll and sway when turning, changing lanes, or driving at high speeds, thereby improving vehicle stability and maneuverability. This is particularly important for the safe operation of electric trucks, especially when transporting heavy cargo, as it ensures the stability of the vehicle's trajectory and direction.

[0015] 3. The ear-free design eliminates complex structural components and reduces the probability of leaf spring failure during use. The relatively simple overall structure eliminates the risk of wear and breakage of the ear, making the leaf spring more reliable and reducing vehicle downtime and repair costs caused by leaf spring failure. Furthermore, the design does not require additional space to accommodate the ear during installation, better accommodating the space layout of the electric truck chassis and providing more space for the installation and arrangement of other components, helping to improve the vehicle's space utilization and cargo capacity.

[0016] 4. The design of the lubrication oil circuit is not only convenient for adding lubricant, but also has better lubrication effect. It can better meet the lubrication needs of multiple steel plates, effectively reduce friction, reduce wear, and extend the service life of leaf springs. At the same time, it can also reduce abnormal noise caused by friction, which helps to ensure the stability and comfort of vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the lubricating oil circuit in the utility model.

[0019] Figure 3 It is an exploded view of the central bolt of the utility model.

[0020] Figure 4 It is a cross-sectional view of the central bolt of the present utility model.

[0021] In the figure: 1. Main spring; 11. Connecting steel sheet; 111. Flat joint; 112. Bending portion; 12. Main steel sheet; 121. Center through hole; 122. Main oil line; 123. Longitudinal oil line; 124. Oil groove; 2. Auxiliary spring; 21. Auxiliary steel sheet; 3. Center bolt; 31. End; 32. Rod body; 321. Polished rod; 322. Threaded portion; 33. Through hole; 34. Oil cap; 35. Oil inlet blind hole; 36. Locking nut; 4. Clamp. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] The utility model discloses a main and auxiliary leaf spring without curling ears.

[0024] Reference Figure 1 A main and auxiliary leaf spring without ear curling includes a main spring 1, an auxiliary spring 2, a center bolt 3, and a clamp 4; wherein the main spring 1 includes a connecting steel sheet 11 and a plurality of main steel sheets 12 attached to the outer arc surface of the connecting steel sheet 11, the length of the main steel sheet 12 decreasing in the direction away from the connecting steel sheet 11; the auxiliary spring 2 is connected to the inner arc side of the main spring 1, and the auxiliary spring 2 includes a plurality of auxiliary steel sheets 21 stacked together, the length of the auxiliary steel sheets 21 increasing in the direction away from the connecting steel sheet 11. In this embodiment, there are three connecting steel sheets 11, four main steel sheets 12, and five auxiliary steel sheets 21. A flat connection portion 111 is formed at both ends of each connecting steel sheet 11, and a bent portion 112 is formed on the flat connection portion 111 of the connecting steel sheet 11 near the main steel sheet 12. The bent portion 112 is bent toward the main steel sheet 12, which acts as a limiter to ensure the stability of the connection between the main and auxiliary leaf springs without ear curling and the vehicle bracket.

[0025] This lug-free, primary and secondary leaf spring is constructed from multiple laminated spring leaves, resulting in high overall strength and the ability to carry heavy weights and loads. It maintains excellent support performance even when fully loaded or navigating complex road conditions, ensuring the vehicle's normal operation and safe operation. The primary and secondary leaf spring structure provides strong lateral support for the vehicle, effectively reducing body roll and sway during turns, lane changes, and high-speed driving, thereby improving vehicle stability and maneuverability. This is particularly important for the safe operation of electric trucks, especially when transporting heavy cargo, ensuring the vehicle's trajectory and direction are stable. The lug-free design eliminates complex structural components and reduces the probability of leaf spring failure during use. The relatively simple overall structure eliminates the risk of lug wear and breakage, making the leaf spring more reliable and reducing vehicle downtime and repair costs caused by leaf spring failure. Furthermore, since no additional space is required to accommodate the lug during installation, it better fits the chassis layout of electric trucks, providing more space for the installation and arrangement of other components, thereby improving vehicle space utilization and cargo capacity.

[0026] Reference Figures 1 to 4 The main spring 1 and auxiliary spring 2 are connected and fixed by a central bolt 3. The central bolt 3 comprises an integrally formed end 31 and a rod 32. The rod 32 comprises a plain portion 321 and a threaded portion 322. The plain portion 321 passes through the center of the main spring 1 and auxiliary spring 2, while the threaded portion 322 extends beyond the main spring 1 and auxiliary spring 2 and is threadedly connected to a lock nut 36. Two clamps 4 are provided, one at each end of the main and auxiliary leaf springs, and each clamp 4 is placed outside the main spring 1 and auxiliary spring 2. The central bolt 3 and clamps 4 ensure the alignment of the leaf spring steel sheets and stability during movement.

[0027] A blind oil inlet hole 35 is formed within the center bolt 3. One end of the blind oil inlet hole 35 extends through the end cap 31 to form an oil inlet. Several through holes 33 are formed in the polished rod portion 321, connecting to the blind oil inlet hole 35. These through holes 33 are arranged axially along the polished rod portion 321 and correspond to the joints between the steel sheets. A lubricating oil circuit is provided on the joint surface of the shorter of the two adjacent steel sheets in the primary and secondary leaf springs without ear curls. This circuit includes a main oil line 122 and several longitudinal oil lines 123 perpendicular to the main oil line 122. A circular oil groove 124 is formed on the outer edge of the central through hole 121 of each steel sheet. The oil groove 124 corresponds to the through hole 33 and connects the main oil line 122 to the oil groove 124. The groove width of the main oil line 122 and the longitudinal oil line 123 ranges from 1mm to 3mm, and the groove depth ranges from 0.5 to 2mm. The end cap 31 is cylindrical, with threads formed on its outer circumference. An oil cap 34 is threadedly connected to the end cap 31, which serves to seal the oil inlet. Therefore, when lubricating the leaf spring, the oil cap 34 is unscrewed, and lubricant is injected into the blind oil inlet hole 35 through the oil inlet. The lubricating oil flows through the through hole 33 into the oil groove 124, and then from the oil groove 124 into the main oil line 122 and each longitudinal oil line 123, thereby fully lubricating the joint surfaces of each steel sheet. This facilitates operation and provides a better lubrication effect.

[0028] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A leaf spring without ear, main or auxiliary, characterized by: The invention comprises a main spring (1), a secondary spring (2) and a central bolt (3), wherein the main spring (1) comprises a connecting steel sheet (11) and a plurality of main steel sheets (12) attached to the outer arc surface of the connecting steel sheet (11), wherein the length of the main steel sheet (12) decreases in a direction away from the connecting steel sheet (11); the secondary spring (2) is connected to the inner arc side of the main spring (1), and the secondary spring (2) comprises a plurality of secondary steel sheets (21) stacked together, wherein the length of the secondary steel sheet (21) increases in a direction away from the connecting steel sheet (11); The main spring (1) and the auxiliary spring (2) are connected and fixed by a central bolt (3); the central bolt (3) includes an integrally formed end head (31) and a rod body (32); the rod body (32) includes a smooth rod portion (321) and a threaded portion (322); the smooth rod portion (321) is arranged in the center of the main spring (1) and the auxiliary spring (2); the threaded portion (322) passes through the main spring (1) and the auxiliary spring (2) and is threadedly connected to a locking nut (36); An oil inlet blind hole (35) is formed in the center bolt (3), one end of the oil inlet blind hole (35) penetrates the end head (31) to form an oil inlet, a plurality of through holes (33) are opened on the polished rod portion (321), the through holes (33) are connected to the oil inlet blind hole (35), and the plurality of through holes (33) are arranged axially along the polished rod portion (321), and the through holes (33) correspond to the joints of the steel sheets.

2. The primary and secondary leaf spring without curled ears according to claim 1, characterized in that: A lubricating oil circuit is provided on the joint surface of the relatively shorter steel sheet among the two mutually attached steel sheets in the main and auxiliary leaf springs without ear curling, and the lubricating oil circuit includes a main oil line (122) and a plurality of longitudinal oil lines (123) perpendicular to the main oil line (122). A circular oil groove (124) is provided on the outer edge of the central through hole (121) of each steel sheet, and the oil groove (124) corresponds to the through hole (33). The main oil line (122) is connected to the oil groove (124).

3. The primary and secondary leaf spring without curled ears according to claim 2, characterized in that: The groove width of the main oil line (122) and the longitudinal oil line (123) is 1mm-3mm, and the groove depth is 0.5-2mm.

4. A primary and secondary leaf spring without curled ears according to any one of claims 1 to 3, characterized in that: The end head (31) is cylindrical, and a thread is formed on the outer peripheral surface of the end head (31). The end head (31) is threadedly connected to an oil cover (34), and the oil cover (34) is used to close the oil inlet.

5. The primary and secondary leaf spring without curled ears according to any one of claims 1 to 3, characterized in that: At least two connecting steel sheets (11) are provided, and flat connection portions (111) are formed at both ends of the connecting steel sheet (11), and a bending portion (112) is formed on the flat connection portion (111) of the connecting steel sheet (11) close to the main steel sheet (12).

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