A torque splitting driveline system

Abstract

The present invention relates to a driveline system (1) wherein face gear (2) systems are used in electric traction systems and wherein torque splitting is realized by means of cylindrical pinion gears (3).

Description

[0001] DESCRIPTION

[0002] A TORQUE SPLITTING DRIVELINE SYSTEM

[0003] Technical Field

[0004] The present invention relates to a driveline system wherein face gear systems are used in electric traction systems and wherein torque splitting is realized by means of cylindrical pinion gears.

[0005] Background of the Invention

[0006] Transmission systems provide the tough torque / power flow by means of force transmission between gears. The speed differences between the drive and driven shafts depend on the tooth number ratios and the torque capacity is higher in gears with high tooth contact ratio. The high number of teeth in contact at the same time makes the system more compact, more efficient and quieter.

[0007] Today, gearbox systems with high efficiency and high torque capacity are required in a compact volume in electric traction systems, and parallel-axis helical gearboxes, parallel-axis planetary gearboxes and coaxial planetary gearboxes are the systems that are currently used. Although each system has different advantages and disadvantages; today, more compact, efficient and silent systems are needed.

[0008] The United States patent document no. US5135442, an application included in the state of the art, discloses a gear mechanism. The invention subject to the said United States patent document comprises a horizontally inclined rotary shaft having a pinion and two face gears rotating in parallel but axially spaced planes. The two face gears are in meshing engagement with the pinion. Each face gear rotates about a shaft that includes a spur gear. A combining gear is in meshing engagement with both spur gears. Torque from the rotary shaft is equally split between the two face gears, reducing the amount of torque each face gear must transmit. The torque is combined from the two face gears by the combining gear, where the torque may then be used to drive the desired mechanism.

[0009] Summary of the Invention

[0010] An object of the present invention is to realize a torque splitting driveline system which allows the electric traction systems to be reduced in volume, increased in efficiency and reduced in noise by means of combining the face gear system that provides high torque capacity and efficiency with the differential.

[0011] Detailed Description of the Invention

[0012] “A Torque Splitting Driveline System Using Surface Gears” realized to fulfil the objective of the present invention is shown in the figures attached, in which:

[0013] Figure 1 is a perspective view of the face gear and cylindrical pinion gears without housing in an inventive torque splitting driveline system.

[0014] Figure 2 is a view of an inventive torque splitting driveline system with housing using face gears.

[0015] Figure 3 is a view of the differential used together with an inventive torque splitting driveline system using face gears.

[0016] The components illustrated in the figures are individually numbered, where the numbers refer to the following:

[0017] 1. Driveline System

[0018] 2. Face Gear

[0019] 3. Pinion Gear

[0020] 4. Differential Mechanism

[0021] 5. Housing An inventive driveline system (1) which can be used in electric traction systems by means of combining it with a differential and allows the traction systems to be reduced in volume, increased in efficiency and reduced in noise comprises at least two face gears (2) one of which is located on the inside and the other is located on the outside; at least one pinion gear (3) which moves between two face gears (2) and enables power to be generated; and at least one differential mechanism (4) which is carried by at least one of the face gears (2) and enables the total torque to be transmitted to the wheels; and at least one housing (5) which includes the face gears (2), the differential mechanism (4) and the pinion gear (3) therein.

[0022] Two face gears (2) included in an inventive driveline system (1) include at least three pinion gears (3) mounted to the housing (5) with bearings between them. The diameter is reduced by reducing the unit load per tooth via a plurality of pinion gears (3) located on the face gear (2). In this way, a reduction occurs in the volume of the driveline system (1). On the other hand, the contact ratio of the face gear (3) is = > (+3). In this way, a transmission wherein torque is transmitted by means of a durable and efficient face gear (2) in a more compact volume is obtained. The face gears (2) generate radial load with the use of cylindrical spur geared pinion gears (3). The two surface gears (2) as right and left derive equal radial loads in opposite directions. In this way, the load-related bearing life ceases to be challenging as the load on the carrier bearings of the pinion gears (3) is at a very low level.

[0023] The pinion gear (3) included in an inventive driveline system (1) is any one of a cylindrical spur gear, a helical gear, a symmetrical gear, an asymmetrical gear. The pinion gear (3) is manufactured on conventional gear grinding machines.

[0024] The housing (5) included in an inventive driveline system (1) is configured to have two face gears (2), three pinion gears (3) that are located between the face gears (2) and contact the face gears (2) at one end, and a meshing geometry for the pinion gears (3). In the preferred embodiment of the invention, the housing (5) is formed by coupling two cast parts as inner and outer parts. The housing (5) comprises at least one gap that will enable the connection of the face gears (2) to the differential. This housing (5) is easily used together with the differential in the traction systems of electric vehicles.

[0025] Industrial Application of the Invention In the inventive driveline system (1), the tooth contact ratio is high by means of the face gears (2) and the dimensions of the gears used in the housing (5) are reduced by means of torque splitting as the pinion gears (3) carry more than one load.

[0026] Within these basic concepts; it is possible to develop various embodiments of the inventive “A Torque Splitting Driveline System (1)”; the invention cannot be limited to examples disclosed herein and it is essentially according to claims.

Claims

CLAIMS1. An inventive driveline system (1) which can be used in electric traction systems by means of combining it with a differential and allows the traction systems to be reduced in volume, increased in efficiency and reduced in noise; characterized by at least two face gears (2) one of which is located on the inside and the other is located on the outside; at least one pinion gear (3) which moves between two face gears (2) and enables power to be generated; and at least one differential mechanism (4) which is carried by at least one of the face gears (2) and enables the total torque to be transmitted to the wheels; and at least one housing (5) which includes the face gears (2), the differential mechanism (4) and the pinion gear (3) therein.

2. A driveline system (1) according to Claim 1 ; characterized by the face gear (2) which includes at least three pinion gears (3) mounted to the housing (5) with bearings between them.

3. A driveline system (1) according to Claim 1 or 2; characterized by the face gear (2) the diameter of which is reduced by reducing the unit load per tooth via a plurality of pinion gears (3) located on the face gear (2).

4. A driveline system (1) according to any one of the preceding claims; characterized by the face gears (2) which generate radial load with the use of cylindrical spur geared pinion gears (3).

5. A driveline system (1) according to any one of the preceding claims; characterized by the pinion gear (3) which is any one of a cylindrical spur gear, a helical gear, a symmetrical gear, an asymmetrical gear.

6. A driveline system (1) according to any one of the preceding claims; characterized by the housing (5) which is configured to have two face gears (2), three pinion gears (3) that are located between the face gears (2) and contact the face gears (2) at one end, and a meshing geometry for the pinion gears (3).

7. A driveline system (1) according to any one of the preceding claims; characterized by the housing (5) which is formed by coupling two cast parts as inner and outer parts.

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