A gearbox comprising gears with an asymmetrical profile

Abstract

The present invention relates to a gearbox (1) which allows the power generated in the motor of electric vehicles to be transmitted to the wheels by using gears (2) with an asymmetric profile.

Description

[0001] A GEARBOX COMPRISING GEARS WITH AN ASYMMETRICAL PROFILE

[0002] Technical Field

[0003] The present invention relates to a gearbox which allows the power generated in the motor of electric vehicles to be transmitted to the wheels by using gears with an asymmetric profile.

[0004] Background of the Invention

[0005] The gears used to transmit the power generated in the motors of electric vehicles to the wheels are required to accurately transmit the power they receive from the motor to the wheels for a long time under the high torque and speed conditions they are exposed to. For this reason, it is needed to design the said gears that can operate under minimum weight and maximum life / torque for a long time. The direction of the loads acting on each other on the gears located in the gearboxes during the said transmission varies by the various driving modes (drive, regeneration). There are various applications such as changing the number of gears, gear modules, gear pressure angle, heat treatment type and / or parameters during the production of the gear for minimizing the problems experienced during the operation of the gears used during the transmission of power from the said motor. In today's applications, asymmetric gears are known to be used in helicopter gearboxes or in the gearboxes of wind turbines. However, there is no application in terms of using gears with asymmetric profile in order to increase the gear resistance in different driving modes during the transmission of the power generated in the engines of electric vehicles to the wheels and to prevent high stress formation caused by the bending moment on the gear. For this reason, there is a need for a gearbox with asymmetric profile gears for enabling the power generated in the engine of electric vehicles to be transmitted to the wheels by operating under minimum weight and maximum life / torque for a long time in different driving modes in the state of art.

[0006] The International patent document no. W02018035190A1, an application included in the state of the art, discloses the asymmetric gear structure. The invention subject to the said International patent document includes a first gear having teeth meshed with teeth of a second gear. Each tooth of the first gear comprises a coast side and a drive side opposed to the coast side. The drive side has a pressure angle that is greater than that of the coast side. The gear train can be part of a powertrain system within a vehicle or can replace a conventional gear train in a retrofit or new build.

[0007] The Chinese patent document no. CN216131348U, another application included in the state of the art and found as a result of the research, discloses a gearbox system with an asymmetric gear design. The invention subject to the said Chinese patent document includes a gearbox adopting an asymmetrical gear design. The gear box comprises a box body, an input shaft, a multi-shunt parallel transmission structure and an output shaft

[0008] Summary of the Invention

[0009] An object of the present invention is to realize a gearbox which allows the power generated in the motor of electric vehicles to be transmitted to the wheels by using gears with an asymmetric profile.

[0010] Detailed Description of the Invention

[0011] “A Gearbox Comprising Gears with an Asymmetrical Profile” realized to fulfd the objective of the present invention is shown in the figure attached, in which: Figure 1 is a schematic view of an inventive gearbox comprising gears with an asymmetrical profile.

[0012] The components illustrated in the figure are individually numbered, where the numbers refer to the following:

[0013] 1. Gearbox

[0014] 2. Gear

[0015] An inventive gearbox (1) which allows the power generated by the engine in electric vehicles to be transmitted to the wheels for a long time and without problems comprises at least two gears (2) with an asymmetrical profile contacting each other for enabling the power generated by the motors of electric vehicles to be transmitted to the wheels.

[0016] The gear (2) included in the inventive gearbox (1) allows the received power to be transmitted by being placed in such a way that they are in contact with each other during the transmission of the power generated in the motor of the electric vehicle to the wheels. There are at least two gears (2) present in such a way that they are in contact with each other between the motor and the wheel in order to transmit the power generated in the motor of the electric vehicle to the wheels. The gear (2) is produced in such a way that an asymmetric profile can be created by using any value of coast-side pressure and root radius of the surfaces in contact with each other. In this way, it is ensured that the stresses formed on the surface due to the contact of the gear (2) profiles on each other during the transmission of the power they receive from the electric motor and stresses due to the bending moment at the root are prevented. In the preferred embodiment of the invention, the power generated in the engine is enabled to be transmitted to the wheels via symmetrical and / or asymmetrical profile surfaces by producing the gear (2) with using values such as, for example 20-20 pressure angle and 47-47 radius coefficient, 25-20 pressure angle and 66-16 radius coefficient, 30-20 pressure angle and 61-01 radius coefficient or 40-20 pressure angle and 12-01 radius coefficient. In this way, the resistance is increased by using a large pressure angle on the coast-side wherein the load due to the bending moment of the gears (2) in contact with each other is large, and the situation occurred due to the errors caused by the large pressure angle is prevented from worsening by using low pressure angle on the other gear (2). In addition, the gear (2) does not need to be enlarged as maximum efficiency is achieved by using a gear (2) with different asymmetric profile under the same load conditions. The gear (2) enables to increase its resistance against the load generated on it depending on each driving mode by using the asymmetric profile produced with different values of pressure angle and radius coefficient during the transmission of the power generated in the engine to the wheels. In this way, it is ensured that the deterioration due to the loads on the profiles is prevented by using gears (2) with asymmetric profiles at different pressure angle and radius coefficient in different driving modes (drive, regeneration) of the electric vehicle and the driving and regenerative modes used in electric vehicles are improved.

[0017] Industrial Application of the Invention

[0018] The inventive gearbox (1) includes at least two gears (2) in contact with each other for enabling the power generated in the motor of the electric vehicles to be transmitted to the wheels. The said gears (2) enable the force received from the motor and / or another gear (2) preceding them to be transmitted to the gear (2) and / or wheel following them. The gear (2) is produced in such a way that the pressure angle and radius coefficient of the profile surfaces contacting each other during the transmission of the force are different from each other, and the gear (2) is provided to have asymmetric profile surface. The loads and pressure force created by the gears (2) on each other are balanced by using different asymmetric profile surfaces in the gears (2) that transmit the force through the gear (2) with asymmetric profile surfaces, and the gear (2) is ensured to operate efficiently at maximum torque with minimum weight. Within these basic concepts; it is possible to develop various embodiments of the inventive “A Gearbox (1) Comprising Gears with an Asymmetrical Profile”; the invention cannot be limited to examples disclosed herein and it is essentially according to claims.

Claims

CLAIMS1. An inventive gearbox (1) which allows the power generated by the engine in electric vehicles to be transmitted to the wheels for a long time and without problems characterized by at least two gears (2) with an asymmetrical profile contacting each other for enabling the power generated by the motors of electric vehicles to be transmitted to the wheels.

2. A system (1) according to Claim 1; characterized by the gear (2) which allows the received power to be transmitted by being placed in such a way that they are in contact with each other during the transmission of the power generated in the motor of the electric vehicle to the wheels.

3. A system (1) according to Claim 1 or 2; characterized by at least two gears (2) which are present in such a way that they are in contact with each other between the motor and the wheel in order to transmit the power generated in the motor of the electric vehicle to the wheels.

4. A system (1) according to any one of the preceding claims; characterized by the gear (2) which is produced in such a way that an asymmetric profile can be created by using any value of coast-side pressure and root radius of the surfaces in contact with each other.

5. A system (1) according to any one of the preceding claims; characterized by the gear (2) which enables to increase its resistance against the load generated on it depending on each driving mode by using the asymmetric profile produced with different values of pressure angle and radius coefficient during the transmission of the power generated in the engine to the wheels.

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