KR101259151B1 - Transmission and driving system or in-wheel driving system for motor vehicle with the same - Google Patents

Abstract

PURPOSE: A transmission, a driving system including the same, and an in-wheel driving system for a vehicle is provided to minimize size and weight by simplifying a structure. CONSTITUTION: A second input gear(50) is coaxially separated from a first input gear(40) for installation. Multiple third gears(61) surround the first input gear for engaging. Multiple fourth gears(62) are respectively connected to each third gear for rotating integrally. The multiple fourth gears surround the second input gear for engaging. A fifth gear(70) is axially connected with the second input gear. The fifth gear comprises the gear in circumference. Multiple sixth gears(82) surrounds the fifth gear for engaging.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a transmission system and a driving system including the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift device and a vehicle in-wheel drive system including the same, and more particularly, to a shift device that can be easily downsized and can reduce a shift shock, and an in-wheel drive system for a vehicle including the same.

Generally, an electric vehicle uses a motor driven by a power supply of a battery as a power source, and the weight of the vehicle is smaller than that of a conventional fossil fuel automobile or a natural gas automobile, and the size is also relatively small.

The development requirements of such an electric vehicle include reduction of the weight and size of the vehicle, improvement of the running speed and fuel consumption, improvement of the charging method, and battery life, and development of a transmission suitable for an electric vehicle has been studied as a major task.

A conventional fossil fuel-powered automobile or a natural gas vehicle has a variety of structures, but usually the clutch and the plurality of gears are engaged with each other to engage the gear of a proper ratio according to an acceleration or deceleration operation of the automobile. The structure for linearly moving the clutch between the gears is also complicated. Such a structure has a large weight and a large volume, and power is transmitted due to engagement of the gears, so that a locking shock occurs.

As described above, when a conventional transmission having a large weight and a large shift shock is applied to an electric automobile, there is a problem that the distance that can be traveled by one time of charging is reduced and the maximum speed is lowered , And it is not easy to apply.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a shift device capable of minimizing weight and volume, a drive system including the same, and an in-wheel drive system for a vehicle.

A clutch disc connected to be rotated together with the drive shaft and slidably connected to the drive shaft in a direction of rotation axis of the drive shaft; And a push rod for slidably moving the clutch mechanism.

Here, the power source may be a motor. In this case, the drive shaft is connected to the motor to receive power from the motor.

The drive shaft may be inserted through the center of the clutch disc.

A power transmission structure may be formed on one side or the other side of the clutch disc to transmit power. The one surface and the other surface may be the disc surface of the clutch disc disposed on both sides with the circumferential surface of the clutch disc interposed therebetween.

In addition, the drive shaft may include a hollow portion, and the push rod may be inserted into the hollow portion. A portion of the push rod inserted into the hollow portion of the drive shaft may be connected to the clutch disc.

The push rod may be connected to the clutch disc in a nonrotating connection relationship. That is, the push rod may be connected so as not to affect the rotation of the clutch disc at all. As an example of such a connection relationship, a connection relation by a ball joint can be considered.

In order to connect the push rod and the clutch disc, a plurality of axial grooves may be formed in the hollow portion of the drive shaft. The spindle further includes a spoke that is connected to the push rod at a hollow portion of the drive shaft, extends through the plurality of through grooves, extends outside the hollow portion of the hollow shaft, and engages with the clutch disc. Here, the spokes and the push rods may be connected in a non-rotating connection relationship.

One or both of the clutch discs may include an input gear that is selectively connected to the power transmission structure to transmit power as the clutch disc is slid in the axial direction. A through hole may be formed at the center of the input gear such that the drive shaft passes through the through hole. The through-hole may be formed sufficiently large so as not to affect the rotation of the drive shaft.

Such an input gear may be included in a gear device including a plurality of gears so as to have a constant reduction ratio.

That is, the shifting of the gear device is achieved according to the operation of the clutch disc, and the shifted rotational speed can be made to be outputted at a constant reduction ratio.

Wherein the input gear of the gear device comprises a first input gear selectively connected to the power transmission structure on the one side of the clutch disc at one side thereof and a second input gear selectively connected to the power transmission structure of the other side of the clutch disc, And a second input gear connected to the first input gear and having a gear number different from that of the first input gear. Here, the second input gear may be hollow to pass through the push rod. The first input gear and the second input gear may be disposed coaxially with the clutch disc.

Further, the gear device may include a third gear meshing with the first input gear, and a fourth gear meshing with the second input gear. The third gear and the fourth gear may be in the form of a compound gear connected to rotate integrally together. The number of gear teeth of the third gear and the number of gear teeth of the fourth gear may be different from each other.

The third gear and the fourth gear surround the first input gear and the second input gear, and may be installed in a plurality of ways. That is, the third gear and the fourth gear may be respectively disposed with the first input gear and the second input gear as sun gears. Here, the third gear and the fourth gear may be supported by the bearing structure of the housing to rotate at a fixed position. That is, the first input gear and the second input gear are made into respective sun gears, but the third gear and the fourth gear can be prevented from revolving around them.

The gear device may include a fifth gear disposed coaxially with the input gear and receiving a rotational force from the input gear. The fifth gear may be hollow so that the push rod passes through the inside of the push rod.

And the fifth gear may be directly coupled to the second input gear of the input gear.

The gear device may include a sixth gear meshed with the fifth gear, and a seventh gear having a gear number different from that of the sixth gear and rotating integrally with the sixth gear. The sixth gear and the seventh gear may be formed in the form of a compound gear.

The sixth gear may surround the fifth gear and may be installed in a plurality of ways. That is, the sixth gear may be connected to the fifth gear with the fifth gear as a sun gear. However, the sixth gear can be supported by the bearing support structure of the housing to rotate at a fixed position without revolving around the fifth gear.

In addition, the gear device may include a ring gear to which the seventh gear meshes with the inner periphery. A plurality of the seventh gears may be provided and engaged with the inner circumference of the ring gear.

The ring gear as described above may be connected to a wheel of the vehicle. Thus, the wheel of the vehicle can be rotated by the rotation of the ring gear. Alternatively, the seventh gear may be directly connected to the wheel of the vehicle. In this case, the compound gear composed of the seventh gear and the sixth gear may be a planetary gear so as to revolve around the fifth gear.

Meanwhile, the power transmission structure may be in the form of protrusions protruding from one surface or the other surface of the clutch disc. The input gear may have a corresponding groove into which the projection may be inserted.

The protrusion may be a ball inserted into one surface or the other surface of the clutch disc. The ball may be buffered and supported by a washer spring installed on the clutch disc.

On the other hand, the transmission according to the present invention may include a clutch device other than the clutch device such as the above-described structure. For example, a clutch gear, which is installed in parallel with the first input gear and the second input gear, and a clutch device which selectively moves the clutch gear in a straight line to the first input gear or the second input gear may be used have.

In addition, in a different form from the above-described clutch device, gears are formed on the inner periphery of the first input gear and the second input gear, and gears are disposed coaxially between the first input gear and the second input gear, May be used. Thus, the clutch gear may be made to perform a clutch action while being linearly moved and selectively engaged with the inner circumference of the first input gear or the second input gear.

Meanwhile, the drive system according to the present invention may include the above-described transmission and a drive motor connected to the transmission. The drive motor may be connected to the transmission so as to be selectively connected to the first input gear and the second input gear of the transmission.

On the other hand, the in-wheel driving system for a vehicle according to the present invention includes the above-described transmission. The drive shaft of the transmission may be connected to a drive motor. And, the transmission may be connected to the vehicle wheel to transmit rotational power. Therefore, the rotational force of the driving motor is transmitted to the vehicle wheel via the transmission.

Disclosure of Invention Technical Problem [10] The transmission of an electric vehicle of the present invention can simplify the structure to minimize volume and weight, and transmit the power through the disk surface of the clutch disk without engaging the clutch disk with the gear. Further, since it is a connection structure of the push rod inserted into the hollow portion of the drive shaft and engaged with the clutch disc, a compact structure can be achieved.

1 is a partially exploded perspective view of a transmission according to a preferred embodiment of the present invention.
Fig. 2 is a sectional view of the coupling state of Fig. 1;
Fig. 3 is a view showing the state of engagement of the hollow drive shaft, the push rod and the clutch disc in Fig. 1
Fig.
4 is a cross-sectional view showing a detailed engagement relationship of the first clutch ball in FIG.
5 and 6 illustrate embodiments of the connection structure of the push rod and the spoke (or clutch disc).
7 shows an in-wheel drive system for a vehicle according to an embodiment of the present invention.

Hereinafter, preferred embodiments of a transmission according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The transmission may be used in a vehicle.

FIG. 1 is a partially exploded perspective view of a transmission according to a preferred embodiment of the present invention, and FIG. 2 is a sectional view of the combined state of FIG.

Referring to FIGS. 1 and 2, a transmission according to a preferred embodiment of the present invention includes a hollow driving shaft 10 rotated by a driving motor 1, a spline 11 formed on an outer surface of the hollow driving shaft 10, A push rod 20 inserted into the hollow drive shaft 10 and moving in the longitudinal direction of the hollow drive shaft 10 by a stepping motor 100 and a push rod 20 inserted into the hollow drive shaft 10, (20) through an opening (12) provided in a part of the outer surface of the hollow driving shaft (10) and coupled with the hollow driving shaft (10) And a clutch disc (30) capable of moving in the longitudinal direction of the clutch disc (10). Here, the openings 12 are formed as a plurality of through-holes formed along the axial direction in the circumferential direction.

A plurality of first clutch balls 31 having the same distance from the center of rotation of the hollow drive shaft 10 are provided on one surface of the clutch disc 30, And a plurality of second clutch balls 32 disposed farther from the center of rotation of the hollow drive shaft 10 than the first clutch balls 31 are provided.

The first clutch ball (31) is inserted into the first clutch ball (30), and the first clutch ball (31) is inserted into the first clutch ball The input gear 40 is located. The hollow drive shaft 10 is inserted into the center of the clutch disc 30 and the second clutch ball 32 is inserted into the clutch disc 30 to be rotated by receiving the rotational force of the hollow drive shaft 10. 2 input gear 50 is located. The second input gear 50 has a larger diameter and a larger number of gear teeth than the first input gear 40.

The third gear 61 and the fourth gear 62 which are engaged with the first input gear 40 and the second input gear 50 constitute a first compound gear 60, respectively. The rotational speed of the first compound gear 60 varies according to the gear ratio of the first input gear 40 or the second input gear 50. [ Although only one first compound gear 60 is shown in FIG. 1, three first compound gears 60 may be disposed at intervals of 120 degrees. Therefore, the first input gear 40 and the second input gear 50 can be engaged with the sun gear. However, in the present embodiment, the first compound gear 60 does not revolve around the first input gear 40 and the second input gear 50. Supported in a fixed position by the bearing structure of the housing and rotated in place.

The third gear 61 is larger in diameter than the fourth gear 62 and has a larger number of gear teeth. The third gear 61 has a smaller number of gear teeth than the second input gear 50. The third gear 61 may be formed so as to have the same number of teeth as the first input gear 40.

The fifth gear 70 is axially coupled to the second input gear 50. The fifth gear 70 is formed with an axial coupling portion 71 for axial coupling. A corresponding portion of the second input gear 50 is inserted into the shaft coupling portion 71 and is axially coupled. The fifth gear 70 has a hollow 73 inside. Thus, the push rod 20 is connected to the stepping motor 100 through the fifth gear 70. The fifth gear 70 is supported by the bearing support structure of the housing at the shaft coupling portion 71 and the opposite end portion 74 thereof.

Here, the fifth gear 70 has a smaller diameter and a smaller number of gear teeth than the second input gear 50.

A sixth gear (82) meshes with the gear (72) formed on the outer periphery of the fifth gear (70). The sixth gear 82 forms a second compound gear 80 together with the seventh gear 83. The second compound gear 80 is supported at its both ends 81 and 84 by the bearing support structure of the housing. The second compound gear 80 surrounds the gear 72 of the fifth gear 70 and is installed at three intervals of 120 degrees.

The sixth gear 82 has a larger diameter and a larger number of gear teeth than the seventh gear 83 and a larger gear tooth number than the fifth gear 70.

The fifth gear 70 and the second compound gear 80 have the same relationship as the sun gear and the planetary gear. However, the second compound gear 80 rotates around the fifth gear 70 only It does not revolve.

On the other hand, the seventh gear 83 is engaged with the ring gear 90. The seventh gear 83 is engaged with the gear 91 formed on the inner periphery of the ring gear 90. The outer circumferential surface 92 of the ring gear 90 can be supported by the bearing support structure of the housing.

When the above-described transmission is applied to an in-wheel drive system for a vehicle, the ring gear 90 can be connected to a vehicle wheel. Thus, the ring gear 90 can rotate together with the vehicle wheel.

Hereinafter, the configuration and operation of the transmission according to the present invention configured as described above will be described in more detail.

First, the driving force of the driving motor 1 is transmitted to the hollow driving shaft 10, and the hollow driving shaft 10 is rotated.

The hollow drive shaft 10 has a pipe structure, and a plurality of splines 11, which are lines protruding in the longitudinal direction, are provided on the outer surface. In addition, a plurality of openings 12, which are opened to a predetermined length, are provided on a surface of the hollow drive shaft 10 where the splines 11 are not formed.

3 is a sectional view for explaining the engagement state of the hollow drive shaft 10, the push rod 20, and the clutch disc 30.

1, 2, and 3, the push rod 20 is inserted into the hollow drive shaft 10. The push rod 20 performs a linear reciprocating movement in the longitudinal direction of the hollow driving shaft 10 in the longitudinal direction of the hollow driving shaft 10 by the action of the stepping motor 100 generating a separate driving force. The stepping motor 100 may be fixed to the housing.

Here, the stepping motor 100 may be replaced with a hydraulic cylinder. A spoke 21 protruding to the outside through an opening 12 of the hollow drive shaft 10 is coupled to an end of the push rod 20. The spoke 21 is engaged with one surface of the clutch disc 30 And is inserted and fixed in the prepared groove. The spokes 21 and the push rods 20 are connected in a non-rotating connection relationship. For example, as shown in Fig. 5, the push rod 20 and the spokes 21 may be connected by a rolling bearing 22, or may be connected by a ball joint 22 as shown in Fig.

The clutch disc 30 is formed with an uneven surface with an inner diameter so as to be engaged with the outer side of the hollow drive shaft 10 on which the spline 11 is formed.

Accordingly, the clutch disc 30 with its spline 11 meshed with the hollow drive shaft 10 also rotates at the same speed. During the rotation of the clutch disc 30, due to the axial movement of the push rod 20, (30) can reciprocate in the longitudinal direction of the hollow drive shaft (10).

At this time, the spline 11 plays a role of transmitting the rotational force and serves as a guide for the linear movement of the clutch disc 30. [

A first input gear 40 is positioned adjacent to the left side of the clutch disc 30 and a second input gear 50 is positioned adjacent to the right side of the clutch disc 30. The hollow drive shaft 10 passes through the center of the first input gear 40 and is inserted into the center of the second input gear 50. The rotational force of the hollow drive shaft 10 is transmitted to the first input gear 40 ) And the second input gear (50).

In this state, when the clutch disc 30 is positioned between the first input gear 40 and the second input gear 50, the rotational force of the hollow drive shaft 10 is in the neutral state, Is not transmitted to both the first input gear (40) and the second input gear (50).

When the push rod 20 moves to the left side, the clutch disc 30 moves toward the first input gear 40, and the first clutch balls 31 of the clutch disc 30 are engaged with the first input gear 40, Is inserted into the groove 41 provided in the clutch disc 40 so that the rotational force of the clutch disc 30 is transmitted to the first input gear 40.

Since the first input gear 40 and the clutch disc 30 may be engaged with each other in the stationary state, there is no difference in the relative rotational speed, The impact may not occur.

When the hollow drive shaft 10 reaches a predetermined speed and needs to be driven at a small gear ratio, the push rod 20 is retracted to move the clutch disc 30 to a neutral position, which is the adjacent position of the second input gear 50 . When the speed of the hollow drive shaft 10 is similarly adjusted according to the information of the angular speed sensor of the second input gear 50 and then slowly pushed into the second clutch gear 32, (Not shown). The clutch disc 30 does not move the drive force of the hollow drive shaft 10 through the reduction ratio between the first input gear 40 and the third gear 61 and the reduction ratio between the second input gear 50 and the fourth gear 62 The second input gear 50 can be rotated without being decelerated.

On the other hand, when a high reduction ratio is requested, the push rod 20 advances to move the clutch disc 30 to the neutral position, which is the adjacent position of the first input gear 40. [ Then, when the speed of the hollow driving shaft 10 is similarly adjusted according to the information of the angular speed sensor of the first input gear 40 and then slowly pushed into the first clutch gear 31, the first clutch ball 31 is rotated, And the clutch disc 30 receives the drive force of the hollow drive shaft 10 between the reduction gear ratio between the first input gear 40 and the third gear 61 and the reduction ratio between the second input gear 50 and the fourth gear 61, The second input gear 50 can be rotated in a state of being decelerated by the product of the reduction ratio between the first input gear 62 and the second input gear 50. [

The rotation of the second input gear 50 is transmitted to the ring gear 92 through the fifth gear 70 and the second compound gear 80. [ Here, the deceleration is further performed while passing through the fifth gear 70 and the second compound gear 80.

4 is a partial cross-sectional view of the clutch disc 30 at the portion where the first clutch ball 31 is inserted.

4, the first clutch ball 31 is inserted into a groove 33 provided in the clutch disc 30, and a washer spring 34 is provided on the bottom surface of the groove 33, and the first clutch ball 31 Is in contact with the side surface of the first input gear 40 rather than being inserted into the groove 41 of the first input gear 40, the shock and noise are reduced, Wear of the first clutch ball (40) or the first clutch ball (31) can be reduced.

The first clutch ball 31 is fixed so as not to be separated by a ring cage 35 coupled to a side surface of the groove 33.

The second clutch ball 32 is also coupled to the first clutch ball 31 by a washer spring in the same manner as the first clutch ball 31 described with reference to FIG.

Here, all of the gears described above may be a spur gear or a helical gear. Helical gears have a better bite rate than spur gears, so they have a smooth and quiet rotation and are often used in transmissions.

As described above, the present invention can simplify the structure of the transmission and minimize the weight and volume, thereby providing a transmission suitable for an electric vehicle, and minimizing occurrence of shift shock and noise.

Meanwhile, FIG. 7 shows an in-wheel drive system to which the above-described transmission is applied.

The transmission used in the in-wheel drive system of Fig. 7 may differ slightly in shape from the above-described transmission. In particular, in the transmission used in the in-wheel drive system of Fig. 7, all the gears are constituted by helical gears.

First, the drive motor 1 is directly connected to the drive shaft 10 of the transmission. That is, the motor shaft of the drive motor 1 is directly connected to the drive shaft 10. Then, the ring gear (90) of the transmission is connected to the vehicle wheel (4). Thus, the ring gear 90 is rotated together with the vehicle wheel 4. [ A tire (3) is coupled to the outer periphery of the vehicle wheel (4).

The ring gear 90 may be connected to the wheel disk of the vehicle wheel 4 by bolts.

The rotation torque of the drive motor 1 is transmitted to the transmission 4 through the drive shaft 10 and then transmitted to the vehicle wheel 4 through the ring gear 90.

Here, the drive motor 1 may be located outside the inner space of the vehicle wheel 4, as shown in FIG. The transmission may be located at least two-thirds of the inner space of the vehicle wheel 4 and a part of the transmission device may protrude inward in the vehicle width direction and be located outside the inner space of the vehicle wheel 4. [ The transmission may be made entirely accommodated in the space inside the vehicle wheel 4, unlike the case of FIG.

The drive motor 1 and the speed change device can be compactly installed on the vehicle wheel, thus achieving a compact in-wheel drive system.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

1: drive motor 2: motor shaft
3: Tire 4: Vehicle wheel
10: hollow drive shaft 11: spline
12: opening portion 20: push rod
21: spoke 30: clutch disc
31: first clutch ball 32: second clutch ball
33: groove 34: washer spring
40: first input gear 50: second input gear
60: first compound gear 61: third gear
62: fourth gear 70: fifth gear
71: shaft coupling portion 72: gear
73: hollow portion 74: end portion
80: second compound gear 81: one end of the rotating shaft
82: sixth gear 83: seventh gear
84: Rotary shaft other end 90: Ring gear
91: gear 92: outer peripheral surface
100: Stepping motor

Claims (8)

A first input gear;
A second input gear disposed coaxially with the first input gear;
A plurality of third gears surrounding and engaging the first input gear;
A plurality of fourth gears connected to rotate integrally with the respective third gears and surrounding and engaging the second input gears;
A fifth gear axially coupled to the second input gear and having a gear on the outer periphery thereof; And
A plurality of sixth gears surrounding and engaging the fifth gear;
. The method according to claim 1,
And a ring gear connected to receive rotational force from the sixth gear. 3. The method of claim 2,
And further includes a plurality of seventh gears connected to rotate integrally with each of the sixth gears and meshed with the inner periphery of the ring gear. The transmission according to claim 3, wherein the sixth gear has a larger number of gear teeth than the seventh gear. The method according to claim 1,
Wherein the second input gear has a larger number of gear teeth than the first input gear and the third gear has a larger number of gear teeth than the fourth gear. The method according to claim 1,
Further comprising a drive shaft installed to pass through the first input gear and selectively connected to the first input gear or the second input gear to transmit a rotational force. A transmission according to any one of claims 1 to 6; And
A drive motor installed such that a motor shaft is disposed coaxially with the first input gear and the second input gear, the drive motor being selectively connected to the first input gear or the second input gear;
The drive system comprising: A transmission according to any one of claims 1 to 6;
A drive motor installed such that a motor shaft is disposed coaxially with the first input gear and the second input gear, the drive motor being selectively connected to the first input gear or the second input gear; And
A vehicle wheel connected to the transmission to receive rotational power;
And a drive motor for driving the vehicle.

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