A curve gear for an automobile transmission

Abstract

This invention relates to the field of automotive transmission technology and discloses a curved gear for automotive transmissions. The gear has multiple curved surfaces, and the material is a nickel-chromium alloy, the same as the material used in [other applications]. This curved gear for automotive transmissions, due to the curved surface shape, easily generates an oil film, producing complete fluid friction, greatly reducing the coefficient of friction, thereby improving its service life and extending the transmission's replacement interval. By using a nickel-chromium alloy as the material, it achieves high strength, corrosion resistance, and rust prevention, further increasing its service life. This technical solution solves the problem that transmissions in common heavy-duty vehicles and container trucks typically need to be replaced about once a year. Furthermore, heavy-duty vehicle transmissions often use counter-gears, which, to prevent noise and maintain smoothness, sacrifice load-bearing capacity, thus affecting their service life.

Description

Technical Field

[0001] This invention relates to the field of automotive transmission technology, specifically to a cam gear for automotive transmissions. Background Technology

[0002] A transmission, also known as a gearbox, is a mechanism used to change the speed and torque from an engine. It can change the transmission ratio between the output shaft and the input shaft in a fixed or progressively increasing manner. A transmission consists of a gear transmission mechanism and a control mechanism. Some cars also have a power output mechanism. Most transmission mechanisms use ordinary gear transmissions, while some use planetary gear transmissions. Ordinary gear transmission transmission mechanisms generally use sliding gears and synchronizers, etc.

[0003] Currently, the gearboxes of heavy-duty trucks and container trucks commonly seen on the road usually need to be replaced about once a year because they need to withstand heavy transportation. In addition, the gearboxes of heavy-duty trucks use cog gears, which have low wear resistance and affect their service life in order to prevent noise and smoothness but at the expense of load-bearing capacity.

[0004] Therefore, we propose a curved gear for automotive transmissions. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a curved gear for an automotive transmission, comprising, wherein the surface is provided with a plurality of, and is in the shape of an arc curve.

[0006] Preferably, the material is a nickel-chromium alloy, and is the same as the material of [other materials].

[0007] Compared with the prior art, the present invention provides a spur gear for automotive transmissions, which has the following advantages:

[0008] Firstly, the spur gears used in this car transmission have a curved surface that easily generates an oil film, producing complete fluid friction, which greatly reduces the coefficient of friction, thereby increasing service life and extending the replacement interval of the transmission.

[0009] Secondly, the cam gears used in this car transmission, made of nickel-chromium alloy, offer high strength, corrosion resistance, and rust prevention, further increasing their service life. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the present invention;

[0011] Figure 2 This is a schematic diagram of Experiment 2 of the present invention;

[0012] Figure 3 This is a schematic diagram of Experiment 2 of the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Please see Figure 1 A curved gear for an automotive transmission includes 1, the surface of which is provided with a plurality of 2, and the 2 are arc-shaped.

[0015] Through the above technical solution, in this invention, since the surface 2 of 1 has an arc curve shape, it is easy to generate an oil film and generate complete liquid friction, which greatly reduces the coefficient of friction, thereby improving the service life of 1 and extending the replacement time of the gearbox.

[0016] Specifically, 1 is made of nickel-chromium alloy, and 1 and 2 are made of the same material.

[0017] Through the above technical solution, by using nickel-chromium alloy as the material of 1, the present invention can achieve high strength, corrosion resistance and rust prevention, and further increase the service life of 1.

[0018] Example:

[0019] A Discussion on the Load-Bearing Capacity of Curved Gears for Automotive Transmissions:

[0020] The load-bearing capacity of gears usually refers to the contact fatigue strength of the tooth surface and the bending fatigue strength of the teeth, which will be discussed in turn below:

[0021] In the meshing of ordinary involute cylindrical gears, the contacting bodies are two parallel cylinders with radii R1 and R2, such as... Figure 2 As shown, the tooth surface contact stress is often calculated using Hertz's formula: Once the gear material and transmitted load are determined, the contact fatigue strength and wear resistance of the tooth surface are directly proportional to the contact line length L and the overall curvature of the contact point. Inversely proportional. For example, comparing the tooth surface contact strength between curvilinear gears and ordinary involute cylindrical gears, curvilinear gears are superior, based on the following reasons:

[0022] 1.1 The instantaneous contact line of the tooth surface is relatively long, such as Figure 3 As shown:

[0023] Figure 3 (a) is an involute cylindrical gear. Figure 3(b) is a curved cylindrical gear. Since the instantaneous contact line of a curved gear is a spatial curve, it is obvious that when the tooth widths of both are the same, the arc length L of the contact line curve must be greater than the straight line L = b, thereby reducing the unit load at the contact point.

[0024] 1.2 In a curved gear, the two tooth surfaces form a convex-concave contact pattern, which reduces the overall curvature. When calculating the tooth surface contact strength of the gear based on the pitch engagement, the overall curvature... Obviously, when the tooth width is b, the meshing angle is α, and the conjugate teeth are...

[0025] With constant radii of curvature p1 and p2, as R→∞... This is the commonly known comprehensive curvature of an involute cylindrical gear. For curved gears, R is a finite value, so their tooth surface contact fatigue strength is higher than that of a typical involute gear. According to the formula above, the increase is generally around 1.6 to 1.7 times, and in practical applications, it can increase many times over.

[0026] 1.3 The bending fatigue strength of spur gears is also improved compared to herringbone gears. This is because: spur gears have a higher overlap coefficient, which reduces the position of the resultant force acting on the teeth, thus reducing the bending moment on the teeth; the tooth thickness at the root of the spur gear is further strengthened, which increases its bending section modulus.

[0027] 1.4. Because the tooth profile is an arc curve, it is easy to generate an oil film, resulting in complete liquid friction, which greatly reduces the coefficient of friction and thus improves the service life.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cam gear for an automotive transmission, characterized in that: It includes (1), and the surface of (1) is provided with a plurality of (2), and (2) is arc-shaped.

2. The spur gear for an automotive transmission according to claim 1, characterized in that, The material of (1) is nickel-chromium alloy, and (1) and (2) are made of the same material.

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