KR102595376B1 - Vehicle torque vectoring device - Google Patents

Abstract

The present invention provides a driving pinion; A differential having a ring gear engaged with the driving pinion; An input shaft coupled to the side gear of the differential; An output shaft forming a concentric axis with the input shaft and being installed to enable relative rotation, and connected to a driving wheel; a first clutch installed between the input shaft and the output shaft; a second clutch installed between the differential case and the output shaft; As the linear displacement formed increases, the normal mode in which the first clutch is engaged is changed to a cruising mode in which both the first and second clutches are disengaged and the second clutch is engaged while the first clutch is maintained disengaged. It is configured to include an operating mechanism provided to sequentially implement the torque vectoring modes.

Description

Vehicle torque vectoring device {VEHICLE TORQUE VECTORING DEVICE}

The present invention relates to a torque vectoring device for a vehicle.

A vehicle's torque vectoring device is a device that actively distributes the power provided by the power source mounted on the vehicle to the left and right driving wheels, thereby improving the vehicle's starting performance and turning driving stability.

A conventional torque vectoring device consists of a mechanism that allows each of the two clutches to control the amount of power transmitted from the power source to the left and right driving wheels. In order to drive the main driving wheel of a vehicle with such a torque vectoring device, the clutch and Excellent durability of related parts such as actuators to control this must be guaranteed, but achieving such durability is not easy.

Additionally, in a vehicle equipped with the torque vectoring device described above, the engaged state of the clutch, etc. cannot be maintained in the case of parking, so there is a problem in that the locked state of the drive wheels cannot be achieved even if the transmission is placed in the parking range.

The matters described as the background technology of the above invention are only for the purpose of improving the understanding of the background of the present invention, and should not be taken as recognition that they correspond to prior art already known to those skilled in the art. It will be.

KR 1020200042597 A

The present invention implements torque vectoring by controlling and supplying power to the driving wheels of the vehicle, while securing sufficient durability required for driving the main driving wheels of the vehicle. When the vehicle is parked, the power and hydraulic pressure of the vehicle are released. The purpose of this invention is to provide a torque vectoring device for a vehicle that allows the vehicle to be in a parked state just by setting the parking mode of the powertrain, such as a transmission, without operating a separate parking brake.

The torque vectoring device for a vehicle of the present invention to achieve the above-described purpose is,

Drive pinion;

A differential having a ring gear engaged with the driving pinion;

An input shaft coupled to the side gear of the differential;

An output shaft forming a concentric axis with the input shaft and being installed to enable relative rotation, and connected to a driving wheel;

a first clutch installed between the input shaft and the output shaft;

a second clutch installed between the differential case and the output shaft;

As the linear displacement formed increases, the normal mode in which the first clutch is engaged is changed to a cruising mode in which both the first and second clutches are disengaged and the second clutch is engaged while the first clutch is maintained disengaged. an operating mechanism provided to sequentially implement the torque vectoring modes;

It is characterized by being composed including.

The operating mechanism is

A piston that creates the linear displacement by provided hydraulic pressure;

an elastic member provided to apply an elastic force to engage the first clutch;

a piston rod installed to press the first clutch with the elastic force of the elastic member and return a linear displacement caused by the hydraulic pressure of the piston;

It may be configured to include.

The output shaft has a drum portion integrally formed therein to accommodate the first clutch;

The elastic member may be made of a wave spring installed inside the drum portion of the output shaft.

The piston rod is,

a pressing unit that pressurizes the first clutch using the elastic force of the elastic member;

a rod portion extending axially from the pressing portion and penetrating the drum portion of the output shaft;

It may be configured to include.

A piston plate may be disposed between the rod end of the piston rod and the piston in a state capable of relative rotation with the piston.

The second clutch may be installed between the drum portion of the output shaft and the retainer connected to the diff case.

In a state where hydraulic pressure is not provided to the piston, the first clutch receives the elastic force provided by the elastic member through the pressing portion of the piston rod to form a engaged state;

As hydraulic pressure is provided to the piston, the piston presses the piston rod through the piston plate, and a state is formed in which the pressing portion of the piston rod releases the first clutch;

As the hydraulic pressure provided to the piston further increases, a state is formed in which the piston engages the second clutch while the first clutch remains disengaged;

The piston may be installed.

The present invention implements torque vectoring by controlling and supplying power to the driving wheels of a vehicle, while securing sufficient durability required for driving the main driving wheels of the vehicle. When the vehicle is parked, the power and hydraulic pressure of the vehicle are released. Even without operating a separate parking brake, the vehicle can be parked simply by setting the parking mode of the powertrain, such as the transmission.

1 is a diagram showing a torque vectoring device for a vehicle according to the present invention;
Figures 2 and 3 are exploded perspective views of the main components of Figure 1;
Figure 4 is a detailed view showing the piston rod of Figure 2;
Figure 5 is a diagram illustrating the device of the present invention implementing the normal mode;
Figure 6 is a diagram explaining how the device of the present invention implements a constant speed mode;
Figure 7 is a diagram explaining how the device of the present invention implements a torque vectoring mode.

Specific structural and functional descriptions of the embodiments of the present invention disclosed in the present specification or application are merely illustrative for the purpose of explaining the embodiments according to the present invention, and the embodiments according to the present invention may be implemented in various forms. and should not be construed as limited to the embodiments described in this specification or application.

Since the embodiments according to the present invention can make various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Terms such as first and/or second may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component, for example, without departing from the scope of rights according to the concept of the present invention, a first component may be named a second component, and similarly The second component may also be referred to as the first component.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between. Other expressions that describe the relationship between components, such as "between" and "immediately between" or "neighboring" and "directly adjacent to" should be interpreted similarly.

The terms used in this specification are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “include” or “have” are intended to indicate the existence of a described feature, number, step, operation, component, part, or combination thereof, but are not intended to indicate the presence of one or more other features or numbers. It should be understood that this does not preclude the existence or addition of steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in this specification, should not be interpreted as having an ideal or excessively formal meaning. .

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing indicate the same member.

1 to 7, an embodiment of the torque vectoring device for a vehicle according to the present invention includes a drive pinion (1); A differential (5) having a ring gear (3) engaged with the driving pinion (1); An input shaft (9) coupled to the side gear (7) of the differential (5); An output shaft (11) formed on a concentric axis with the input shaft (9) and installed to enable relative rotation, and connected to a driving wheel; A first clutch (13) installed between the input shaft (9) and the output shaft (11); A second clutch (15) installed between the differential case (6) of the differential (5) and the output shaft (11); As the linear displacement formed increases, the normal mode in which the first clutch 13 is engaged is changed to the cruising mode in which both the first clutch 13 and the second clutch 15 are released and the first clutch 13 It is configured to include an operating mechanism provided to sequentially implement a torque vectoring mode in which the second clutch 15 is engaged while the release of ) is maintained.

That is, in the present invention, when the power provided by the power source mounted on the vehicle is supplied to the drive pinion (1) and the linear displacement formed by the operating mechanism is the smallest, the drive pinion (1) as shown in FIG. When a normal mode is formed in which the supplied power is transmitted to the driving wheel through the differential 5, the first clutch 13, and the output shaft 11, and the linear displacement formed by the operating mechanism slightly increases, as shown in Figure 6 Likewise, both the first clutch 13 and the second clutch 15 are released, forming a constant speed mode in which the drive wheel coasts independent of the power source and differential 5, and the straight line formed by the operating mechanism is formed. When the displacement further increases, as shown in FIG. 7, the first clutch 13 maintains the released state and the fastening amount of the second clutch 15 increases, thereby implementing a torque vectoring mode in which torque vectoring can be performed. It is structured so that it can be done.

Therefore, the present invention implements torque vectoring by allowing power to be controlled and supplied to the driving wheel using the torque vectoring mode, and also provides a normal mode in which only the first clutch 13 is simply engaged and the first clutch ( By using the constant speed mode in which both 13) and the second clutch 15 are released, the required sufficient durability can be secured even when the device of the present invention is installed to drive the main drive wheels of the vehicle.

In addition, when the vehicle is parked, the first clutch 13 is engaged in the normal mode and the driving wheel is automatically connected to the transmission, etc., even without operating a separate parking brake while the vehicle's power and hydraulic pressure are released. As a result, it is possible to create a parked state of the vehicle simply by setting the transmission, etc. to the parking mode.

For reference, the drive pinion (1) can be connected to a power source such as an engine or motor through a transmission or reducer, so when the parking mode is set in the transmission or reducer, the differential (5) and the first clutch (13) It is connected to the drive wheel through

For reference, in Figures 5 and 6, the linear displacement of the piston is very small, so the difference in the position of the piston between the drawings is not clearly expressed, so the difference in operating state is expressed by expressing the flow of power with an arrow. It is explained.

In this embodiment, the operating mechanism includes: a piston 17 that forms the linear displacement by provided hydraulic pressure; an elastic member 19 provided to apply an elastic force for fastening the first clutch 13; It is configured to include a piston rod 21 installed to pressurize the first clutch 13 with the elastic force of the elastic member 19 and return the linear displacement caused by the hydraulic pressure of the piston 17.

That is, the operating mechanism of the present invention is configured to sequentially form the normal mode, constant speed mode, and torque vectoring mode by linear displacement formed while the piston moves according to the hydraulic pressure provided, and hydraulic pressure is supplied to the piston. In the released state, the piston rod 21 presses the first clutch 13 by the elastic member 19 and the piston 17 returns, which is the normal mode.

In this embodiment, the output shaft 11 is integrally formed with a drum portion 23 accommodating the first clutch 13 therein; The elastic member 19 consists of a wave spring 25 installed inside the drum portion 23 of the output shaft 11, allowing the device of the present invention to be configured compactly.

As shown in detail in FIG. 4, the piston rod 21 includes a pressing portion 27 that presses the first clutch 13 with the elastic force of the elastic member 19; It is configured to include a rod portion 29 that extends axially from the pressing portion 27 and penetrates the drum portion 23 of the output shaft 11.

For reference, in this embodiment, the wave spring 25 is connected to the spring seat 33 and the piston rod 21 by a snap ring 31 coupled to the inside of the drum portion 23 of the output shaft 11. It is installed between the pressurizing parts (27).

Additionally, a piston plate 35 is disposed between the end of the rod portion 29 of the piston rod 21 and the piston 17 in a state capable of relative rotation with the piston 17.

That is, the piston rod 21 rotates together with the output shaft 11, and a thrust bearing 37 is provided between the piston plate 35 and the piston 17, so that the piston 17, which does not rotate, It is configured to transmit the provided linear displacement to the rotating piston rod 21 through the thrust bearing 37 and the piston plate 35.

For reference, a shim 39 for adjusting the end play of the first clutch 13 is interposed between the piston plate 35 and the thrust bearing 37.

In this embodiment, the second clutch 15 is installed between the drum portion 23 of the output shaft 11 and the retainer 41 connected to the differential case 6.

That is, the retainer 41 is connected to the differential case 6 in a restricted rotation state and is formed to be spaced apart from the outside of the drum portion 23 of the output shaft 11, between which the second clutch (15) was placed.

For reference, here, the first clutch 13 and the second clutch 15 have a multi-plate clutch structure as shown, and the multi-plate clutch substantially consists of two rotating bodies, a clutch plate and a clutch installed overlapping each other between them. It is composed of a combination of disks, but for convenience of explanation, the combination of multiple clutch plates and clutch disks overlapped between two rotating bodies as described above is expressed as a 'clutch'.

The piston 17, in a state in which hydraulic pressure is not provided to the piston 17, the first clutch 13 uses the elastic force provided by the elastic member 19 to press the pressing portion of the piston rod 21 ( 27) to form a fastened state, and as hydraulic pressure is provided to the piston 17, the piston 17 presses the piston rod 21 through the piston plate 35, After the pressing portion 27 of the piston rod 21 releases the first clutch 13, as the hydraulic pressure provided to the piston 17 further increases, the first clutch 13 While the released state is maintained, the piston 17 is installed to engage the second clutch 15.

That is, the piston 17, as shown, presses the piston plate 35 and the piston rod 21 to release the first clutch 13, and engages the second clutch 15. The part that engages the second clutch 15 must be formed separately, and in this embodiment, the part that fastens the second clutch 15 has a more protruding structure.

That is, the distance between the part of the piston 17 that releases the first clutch 13 and the part that fastens the second clutch 15 must be appropriately set, depending on the linear displacement of the piston 17. The normal mode, constant speed mode, and torque vectoring mode as described above can be implemented sequentially.

For reference, in Figures 1 to 3, only the part connected to the right driving wheel from the differential 5 is shown, but the part connected to the left driving wheel is also configured symmetrically, and the two second clutches 15 provided on both sides are ) By adjusting the degree of fastening with the hydraulic pressure provided by the piston, torque vectoring of the vehicle as described above is implemented.

In the normal mode state of Figure 5, the first clutch 13 is maintained by the pressure applied by the piston rod 21 with the elastic force of the elastic member 19, so the drive pinion 1 The power input to the differential (5) is transmitted to the output shaft (11) through the first clutch (13) and reaches the driving wheels.

In other words, it has the same power transmission state as a vehicle equipped with a conventional differential 5, and the first clutch 13 continuously maintains the fastened state by the elastic force of the elastic member 19, so it can be used during normal driving. In this situation, almost no frictional heat is generated, ensuring high durability.

Of course, in this state, hydraulic pressure is not applied to the piston 17, and the second clutch 15 is released.

For reference, in this embodiment, the linear displacement is formed by the linear movement of the piston 17 by hydraulic pressure, but instead of this, various other linear actuators configured to form linear displacement using a motor or the like can also be used. Of course.

In the cruising mode of FIG. 6, the piston 17 forms a slight linear displacement, the first clutch 13 is released, and the second clutch 15 remains released, and the drive wheel is disconnected from the differential (5) and the entire power train from the power source to the drive pinion (1).

That is, the rotation of the drive wheel is transmitted only to the output shaft 11 and is not input to the differential 5 by the first clutch 13 and the second clutch 15, so the vehicle operates while minimizing drag. , it is possible to form an excellent coasting state, greatly improving the fuel efficiency or fuel efficiency of the vehicle.

Of course, in the above-mentioned state, no frictional heat is generated in the first clutch 13 and the second clutch 15, and excellent durability can be ensured.

In the torque vectoring mode of FIG. 7, the hydraulic pressure provided to the piston 17 is actively controlled at a level or higher that implements the constant speed mode, thereby changing the fastening amount of the second clutch 15 to control the differential case 6. ) and the output shaft 11 to continuously adjust the degree of power transmission, thereby implementing the torque vectoring function.

Although the present invention has been shown and described in relation to specific embodiments, it is known in the art that various improvements and changes can be made to the present invention without departing from the technical spirit of the invention as provided by the following claims. This will be self-evident to those with ordinary knowledge.

One; Drive pinion
3; ring gear
5; differential
6; Def case
7; side gear
9; input shaft
11; output shaft
13; 1st clutch
15; 2nd clutch
17; piston
19; Elastic member
21; piston rod
23; drum department
25; wave spring
27; pressurized part
29; load department
31; snap ring
33; spring seat
35; Piston plate
37; Thrust bearing
39; center
41; retainer

Claims (7)

Drive pinion;
A differential having a ring gear engaged with the driving pinion;
An input shaft coupled to the side gear of the differential;
An output shaft forming a concentric axis with the input shaft and being installed to enable relative rotation, and connected to a driving wheel;
a first clutch installed between the input shaft and the output shaft;
a second clutch installed between the differential case and the output shaft;
As the linear displacement formed by one piston increases, the normal mode in which the first clutch is engaged is changed to the cruising mode in which both the first and second clutches are released, and the release of the first clutch is maintained while the second clutch is maintained. An operating mechanism provided to sequentially implement a torque vectoring mode in which two clutches are engaged;
A torque vectoring device for a vehicle comprising: In claim 1,
The operating mechanism is
the piston forming the linear displacement by provided hydraulic pressure;
an elastic member provided to apply an elastic force to engage the first clutch;
a piston rod installed to press the first clutch with the elastic force of the elastic member and return a linear displacement caused by the hydraulic pressure of the piston;
A torque vectoring device for a vehicle comprising: In claim 2,
The output shaft has a drum portion integrally formed therein to accommodate the first clutch;
The elastic member is made of a wave spring installed inside the drum portion of the output shaft.
A torque vectoring device for a vehicle characterized by a. In claim 3,
The piston rod is,
a pressing unit that pressurizes the first clutch using the elastic force of the elastic member;
a rod portion extending axially from the pressing portion and penetrating the drum portion of the output shaft;
A torque vectoring device for a vehicle comprising: In claim 4,
A piston plate is disposed between the rod end of the piston rod and the piston in a state capable of relative rotation with the piston.
A torque vectoring device for a vehicle characterized by a. In claim 5,
The second clutch is installed between the drum portion of the output shaft and the retainer connected to the diff case.
A torque vectoring device for a vehicle characterized by a. In claim 6,
In a state where hydraulic pressure is not provided to the piston, the first clutch receives the elastic force provided by the elastic member through the pressing portion of the piston rod to form a engaged state;
As hydraulic pressure is provided to the piston, the piston presses the piston rod through the piston plate, and a state is formed in which the pressing portion of the piston rod releases the first clutch;
As the hydraulic pressure provided to the piston further increases, a state is formed in which the piston engages the second clutch while the first clutch remains disengaged;
The piston is installed
A torque vectoring device for a vehicle characterized by a.