KR101571967B1 - Power Shift Transmission for Vehicle - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power shift transmission for a vehicle which can reduce power loss by greatly reducing the number of clutches and which can be applied to a narrow space through a mechanical synchronizer and an electric motor actuator.
The present invention comprises first and second gears (11) and (12) provided on a drive shaft (10) that receives power from an engine and rotates; The first and second clutches 13 and 13 are disposed between the first and second gears 11 and 12 so that the power of the drive shaft 10 can be transmitted to the first gear 11 or the second gear 12, (14); A first power transmission shaft 20 spaced apart from the drive shaft 10 to receive power from the first gear 11 or the second gear 12, respectively; A forward / backward synchronizer 30 provided on the first power transmission shaft 20; A peripheral synchronizer 40 provided on one side of the forward and backward synchronizers 30; And a pair of transmission gears 54 and 55 provided on a second power transmission shaft 50 provided on one side of the first power transmission shaft 20 to be connected to the power transmission shaft 50, And the third and fourth clutches 51 and 52 provided on the second power transmission shaft 50 to transmit the second and third clutches 51 and 52, respectively.

Description

[0001] Power Shift Transmission for Vehicle [0002]

The present invention relates to a power shift transmission for a vehicle, and more particularly, to a power shift transmission for a vehicle, which more greatly reduces the number of clutches, reduces power loss through a mechanical synchronizer and an electric motor actuator, It is.

2. Description of the Related Art Generally, a vehicular transmission, for example, a transmission for a tractor, has a structure in which various stages of transmission portions are sequentially coupled from an engine.

In other words, it has a forward / backward shifting portion that switches the rotational power of the engine to the forward direction and the backward direction, a main speed changing portion that shifts from the output side of the forward / backward shifting portion, and a sub shift portion that shifts the speed at the output side of the main speed changing portion.

Further, it has a power take-off (PTO) transmission portion that provides power for driving a working machine mounted on the rear portion of the tractor.

[0003] In such a speed change device, a speed change device that employs a power shift method in which the main speed change portion is automated by a hydraulic clutch instead of a general synchromesh mechanism has been developed.

However, in the case of the conventional power shift transmission, the speed and running direction were changed using a wet type multi-plate clutch.

In recent years, a wet multi-plate clutch and a synchronizer, which is a mechanical synchronous transmission, are used in combination to minimize the power loss of the power seat transmission, but all of the operations are made up of hydraulic actuators

The conventional wet multi-plate clutch is an essential construction for implementing an automatic transmission, but has a lower power efficiency than a mechanical transmission.

Further, in the conventional transmission, a wet multi-plate clutch is required, one for each shift speed. For example, in the case of a tractor, since it has a structure of four stages, six stages or eight stages in peripheral speed, In this case, six, eight, or ten clutches are provided. To add one of these clutches, the pump capacity must also be increased and additional actuating valves must be provided.

The clutch is always in a state of power loss. In the past, as the number of shift stages increases, the number of clutches increases. Accordingly, the power loss increases and the oil temperature rises in proportion to the increase in the number of clutches. There is a problem that the capacity of the oil cooler must be increased.

In addition, hydraulic actuators (wet multi-plate friction clutches, hydraulic cylinders, etc.) require hydraulic pressure for operation and a hydraulic pump must be operated to provide constant pressure and flow at all times.

When the hydraulic pump is driven, the power of the engine is consumed in proportion to the pressure and the flow rate to be formed, so that the power for driving the transmission and the working machine is lost.

In addition, since the wet type multi-plate clutch occupies a large space for transmitting the same power as compared with the mechanical synchronizer, there is a disadvantage that the transmission gear structure is very complicated to be disposed in the mechanical transmission space.

Korean Patent No. 373595 (Feb.

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an automatic transmission for automatically shifting forward and rearward speeds and eight- The present invention provides a power shift transmission for a vehicle that can be applied in a narrow space by attaching an electric actuator to front and rear synchronizers and peripherals in the vicinity of the synchronizer, greatly reducing the number of clutches, reducing power loss, and simplifying the structure.

According to an aspect of the present invention, there is provided a driving apparatus for a vehicle, comprising: first and second gears provided on a driving shaft that receives power from an engine and rotates; First and second clutches provided between the first and second gears so that the power of the drive shaft can be transmitted to the first gear or the second gear; A first power transmission shaft spaced apart from the drive shaft so as to receive power from the first gear or the second gear, respectively; A forward / backward synchronizer provided on the first power transmission shaft; A peripheral synchronizer provided at one side of the forward and backward synchronizers; And a third and fourth clutches provided on the second power transmission shaft so as to transmit power of the second power transmission shaft while being interrupted by a pair of transmission gears provided on the second power transmission shaft provided at one side of the first power transmission shaft .

The first and second gears are disposed on the first power transmission shaft. The gears include third and fourth gears meshed with the first and second gears, and a forward gear and a reverse gear provided to transmit power according to the operation of the forward and backward synchronizers. Structure.

The forward driven gear is disposed on the extended portion of the drive shaft so as to receive the power of the forward gear. The forward driven gear is disposed on the drive shaft such that the power of the drive shaft is not transmitted directly, And the first to fourth gears that rotate at the same time.

In addition, the structure includes a first to fourth stage driven gear and a counter drive gear that receive power transmitted to one side of the synchronizer in the periphery in association with the first to fourth short gears.

The second power transmission shaft includes a driven gear that engages with the counter drive gear and receives power to rotate the second power transmission shaft and the third and fourth clutches.

In addition, a third power transmission shaft provided separately from the first power transmission shaft includes a pair of driven gears that are engaged with a pair of transmission gears provided on the second power transmission shaft to receive power.

In addition, on the third power transmission shaft and the fourth power transmission shaft, an ultra low speed selection unit and a negative speed selection unit are respectively provided.

 In addition, an ultra-low speed first drive gear is provided at one side of the ultra-low speed selection portion to receive power when the ultra low speed selection portion is in an ON state, and an ultra low speed drive gear which receives the power of the ultra low speed first drive gear and rotates at the same time, 1 driven gear and an ultra-low speed second drive gear, and an ultra low speed second driven gear which is engaged with the ultra low speed second drive gear and receives power is provided at one side of the ultra low speed selection part.

Further, one side of the negative speed change selection portion is provided with a downshift driven gear that transmits power to the negative speed change drive gear when the negative speed change select portion is connected to the low speed position It is an organized structure.

In addition, the structure includes an electric motor type forward / backward actuator and an actuator in the periphery which are connected to the forward and backward synchronizers and the synchronizers in the periphery.

As described above, according to the present invention, the number of clutches can be significantly reduced as compared with the conventional transmission, and the capacity of the pump can be reduced in proportion to the use of the electric motor type actuator, have.

In addition, since the electric power is supplied from the battery or the generator of the vehicle only at the time of shifting by using the electric motor type actuator, the actuator is operated. Therefore, the power loss generated by using the hydraulic pump fixedly by using the conventional hydraulic type actuator There is an advantage not to occur.

Further, compared with the conventional hydraulic actuator and valve, the number of parts is small and the existing link can be applied as it is. Further, when the capacity of the hydraulic pump increases as the number of clutches increases, There is a problem in that the capacity of the oil cooler can be increased because the temperature is increased to cause overheating. However, the present invention uses such an electric motor type actuator, so that the conventional problem does not occur at all.

1 is a block diagram showing a transmission according to an embodiment of the present invention.
2 is a schematic view showing a connection relationship between a forward-reverse actuator, a peripheral actuator, and a pump and a valve in a transmission according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a transmission according to an embodiment of the present invention.

As shown in the drawings, a transmission 1 according to an embodiment of the present invention includes first and second gears 11 and 12 mounted on a drive shaft 10 that receives power from an engine and rotates inside a case 2, The first gear 11 and the second gear 12 are disposed between the first and second gears 11 and 12 so that the power of the drive shaft 10 can be transmitted to the first gear 11 or the second gear 12, 1 and 2 clutches 13 and 14 are provided.

A first power transmission shaft 20 is provided on a side surface of the drive shaft 10 so as to receive power from the first gear 11 or the second gear 12, On the power transmitting shaft 20, third and fourth gears 21 and 22 for engaging with the first and second gears 11 and 12 are provided.

A forward / reverse synchronizer 30 is provided on the first power transmission shaft 20, and a forward / high gear 31 and a reverse gear 32 are provided on both sides of the first power transmission shaft 20.

The forward / high gear 31 is a gear that is applied when the transmission is advanced or when the transmission is shifted to a higher gear, that is, 5 to 8 gears.

A driven gear 15 for receiving the power of the forward / high gear 31 is provided on the extended portion of the drive shaft 10 and a low gear 16 disposed at a distance from the forward driven gear 15, . The low-stage gear 16 is a gear that is applied in 1 to 4-speed shifting.

The power of the drive shaft 10 is not directly transmitted to the forward driven gear 15 and the low end gear 16 and the forward driven gear 15 receives the power of the forward / , So that the first to fourth gears 16 rotate simultaneously.

One side of the forward and backward synchronizers 30 includes a peripheral synchronizer 40, a variable speed driven gear 41 engaged with the lower gear 16 to receive power, and a counter drive gear 42 Respectively.

In FIG. 1, the left and right sides of the forward synchronizer 30 indicate the forward (R) direction and the forward (F) direction, respectively. The rightward direction of the peripheral synchronizer 40 is 1 to 4, It shows 5 to 8 speed change.

A second power transmission shaft 50 is provided on one side of the first power transmission shaft 20 and the third and fourth clutches 51 and 52 are installed on the second power transmission shaft 50 A driven gear 53 that is engaged with the counter drive gear 42 to receive power and rotates the second power transmission shaft 50 and the third and fourth clutches 51 and 52 on the second power transmission shaft 50, And transmission gears 54 and 55 driven by the third and fourth clutches 51 and 52, respectively.

A driven gear 24 (25) that is engaged with the transmission gears (55) and receives power is installed on a third power transmission shaft (23) provided separately from the first power transmission shaft (20) do.

Also, an ultra low speed selector 60 and a negative speed selector 70 are provided on the third power transmission shaft 23 and the fourth power transmission shaft 26, respectively.

The super-low speed selection unit 60 is a reduction device for reducing the speed of the vehicle. The auxiliary speed change selection unit 70 is a device for increasing or decreasing the speed by shifting the power transmitted from the periphery to the low and high speeds.

In addition, an ultra low speed first drive gear 61 receiving power is provided on one side of the ultra low speed selection unit 60 when the ultra low speed selection unit 60 is ON.

An extremely low speed first driven gear 62 and an extremely low speed second driving gear 63 are provided on the driving shaft 10 to rotate at the same time by receiving the power of the ultra low speed first driving gear 61.

The first low speed drive gear 62 and the second low speed drive gear 63 are not directly powered by the drive shaft 10 but are driven by the ultra low speed first drive gear 61, When the gear 62 receives the power, the second low-speed second drive gear 63 receives the power and rotates at the same time.

Also, a very low-speed second driven gear 64 is provided at one side of the ultra-low speed selection unit 60 for receiving power transmitted through the ultra low speed second drive gear 63.

1, the left side of the auxiliary speed change selection portion 70 is the high speed (HI) direction and the left side is the low speed (LO) direction.

When the auxiliary speed change selection portion 70 is connected to the low (LO) position, the auxiliary speed change drive gear 71 is provided at one side of the auxiliary speed change selection portion 70, Deliver power.

The lower portion of the auxiliary speed change selecting portion 70 is provided with a downshift driven gear 72 engaged with the auxiliary speed change drive gear 71 to receive power.

The driven gear 72 is connected to the parking brake clutch 80 via a connecting shaft 73 and the transmission gear 74 is provided on the connecting shaft 73.

Further, one side of the auxiliary speed change selection portion 70 is provided with a four-wheel drive gear 75 that is engaged with the transmission gear 74 to receive power.

The four-wheel drive gear 75 is coupled to a pinion shaft 90. A pinion drive gear 91 is disposed on the pinion shaft 90. The power of the pinion drive gear 91 is transmitted to the pinion drive gear 91, And is transmitted to the pinion driven gear 92 arranged to be engaged with the pinion driven gear 91.

The pinion driven gear 92 is connected by a wheel to rotate the rear wheel of the vehicle.

In addition, according to the present invention, the forward and backward actuator 100 and the peripheral actuator 110 are connected to the forward and backward synchronizers 30 and the peripheral speed synchronizer 40, respectively.

The front-and-rear actuator 100 and the peripheral actuator 110 are driven by an electric motor, unlike the conventional (hydraulic type) actuator. Although not shown in the drawings, To the motor arm, and the power transmitted to the motor arm has a structure to rotate the link arm. When the link arm is rotated, the fork connected to the forward synchronizer 30 and the peripheral synchronizer 40 is moved so as to be operated (forward or backward).

The first, second, third and fourth clutches 13, 14, 51 and 52 are connected to a pump 200 connected to the engine so as to transfer the oil according to the rotation of the vehicle engine, And is connected to a valve 210 which is sucked by the pump 200 to selectively supply the oil to be pumped.

In the figure, reference numeral 300 denotes a PTO (Power Take-Off) selection clutch, which serves as interlocking means for connecting or disconnecting power to a power take-off shaft (PTO) provided at the rear end of the transmission. Reference numeral 400 denotes a GSP (Ground Speed PTO) And is used when the vehicle speed and the rotation of the PTO shaft have to be the same. In other words, when the vehicle is ON, the vehicle speed and the PTO speed become the same, and when the vehicle is OFF, the vehicle speed is the same as the engine speed.

As shown in Fig. 3, the present invention having such a configuration is characterized in that an automatic transmission for a tractor capable of automatically performing forward and backward shifts and eight-speed shifting is provided with an electric motor-driven actuator, (110) is connected to the front and rear synchronizers (30) and (40) in order to increase the efficiency. The total number of clutches is minimized so that a total of four clutches are used and two synchronizers Speed range selection section 60 and the auxiliary speed change selection section 70 can implement 32 forward and reverse speeds.

Here, the power transmission flow in the first forward stroke according to the embodiment of the present invention will be described with reference to FIG.

The power generated by the engine of the vehicle (for example, a tractor) rotates the drive shaft 10 and the first and second clutches 13 and 14 rotate so that the first clutch 13 is engaged with the first gear 11 The power of the drive shaft 10 is transmitted to the third gear 21 disposed on the first power transmission shaft 20 through the first gear 11 and rotated.

As the third gear 21 rotates, the first power transmitting shaft 20 rotates to rotate the forward and backward synchronizers 30, and the forward and reverse synchronizers 30 rotate the forward / To transmit the power.

The forward / driven gear 31 is engaged with the forward driven gear 15 so that the forward / driven gear 31 is transmitted with the power to rotate the forward driven gear 15, The lower gear 16 is rotated at the same time when the forward driven gear 15 is rotated.

The power of the speed-change driven gear 41 is transmitted to the speed change gear 41 via the speed change gear 41. Thus, the speed change gear 41 meshed with the low-speed gear 16 rotates and accordingly the peripheral speed synchronizer 40 is connected to the speed change driven gear 41, And is transmitted to the drive gear 42.

The synchronizer 40 is connected to the forward / high gear 31. When the forward / reverse gear 31 is to be shifted to the high speed of 5 to 8 stages, the synchronizer 40 in the periphery is connected to the forward / And the synchronizer 40 in the periphery is rotated at the same time, so that power is directly transmitted to the counter drive gear 42, so that the shift is performed in 5 to 8 steps.

The counter drive gear 42 is meshed with the driven gear 53 so that the power of the counter drive gear 42 is transmitted to the driven gear 53 and the second power transmission shaft 50, (51) and (52) rotate. And the driven gear 24 is rotated through the transmission gear 54 connected to the third clutch 51.

As the driven gear 24 rotates, power is transmitted to the negative speed change selecting unit 70 through the ultra-low speed selecting unit 60.

When the super low speed selection unit 60 is in the ON state, the power of the driven gear 24 is transmitted to the super low speed first drive gear 61, the ultra low speed first driven gear 62, the ultra low speed second drive gear 63 Speed selection section 60 in a decelerated state through the first and second low-speed driven gears 64 and 64, respectively.

The auxiliary speed select portion 70 is connected in a low (LO) state to transmit power to the auxiliary speed change drive gear 71. The power of the auxiliary speed change drive gear 71 is transmitted to the speed change driven gear 72 and the auxiliary speed change driven gear 72 is transmitted to the four wheel drive gear 75).

The four-wheel drive gear 75 transmits power to the pinion shaft 90 which transmits power to the pinion driven gear 92 through the pinion drive gear 91.

The pinion driven gear 92 is connected by a wheel to rotate the rear wheel.

Table 1 shows the selection states of the synchronizers according to the operation of the clutch and the actuator according to the number of forward 1 to 8-speed shift stages in the transmission according to the present invention.

Surrounding
singular
1st stage
2nd stage
3rd stage
4 stage
5 stage
6 stages
7th stage
8 stage
clutch
The first clutch (13)

The first clutch (13)
The second clutch (14)
The second clutch (14)
The first clutch (13)
The first clutch (13)
The second clutch (14)
The second clutch (14)
The forward and reverse synchronizers 30,

Forward (F)
Forward (F)
Forward (F)
Forward (F)
Forward (F)
Forward (F)
Forward (F)
Forward (F)
Peripheral Synchronizer (40)


1-4

1-4

1-4

1-4

5 ~ 8

5 ~ 8

5 ~ 8

5 ~ 8
clutch
The third clutch (51)
The fourth clutch (52)
The third clutch (51)
The fourth clutch (52)
The third clutch (51)
The fourth clutch (52)
The third clutch (51)
The fourth clutch (52)

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But fall within the scope of the appended claims.

1: Transmission
10:
11: First gear
12: Second gear
13: First clutch
14: Second clutch
15: forward driven gear
16: Lower gear
20: first power transmission shaft
21: Third gear
22: Fourth gear
23: Third power transmission shaft
24, 25: driven gear
26: Fourth power transmission shaft
30: forward and backward synchronizer
31: forward / high gear
32: Reverse gear
40: Peripheral synchronizer
41: Lower stage driven gear
42: Counter drive gear
50: second power transmission shaft
51: Third clutch
52: Fourth clutch
53: driven gear
54,55: transmission gear
60: super low speed selection unit
61: super low speed first drive gear
62: super low speed first driven gear
63: Ultra low speed second drive gear
64: super low speed second driven gear
70:
71: Secondary speed drive gear
72: Sub-speed driven gear
73: Connection axis
74: transmission gear
75: Four wheel drive gear
80: Parking brake clutch
90: Pinion shaft
91: Pinion drive gear
92: Pinion driven gear
100: forward / backward actuator
110: Peripheral actuator
200: pump
210: Valve

Claims (10)

First and second gears (11) and (12) provided on a drive shaft (10) that receives power from the engine and rotates;
The first and second clutches 13 and 13 are disposed between the first and second gears 11 and 12 so that the power of the drive shaft 10 can be transmitted to the first gear 11 or the second gear 12, (14);
A first power transmission shaft 20 spaced apart from the drive shaft 10 to receive power from the first gear 11 or the second gear 12, respectively;
A forward / backward synchronizer 30 provided on the first power transmission shaft 20;
A peripheral synchronizer 40 provided on one side of the forward and backward synchronizers 30;
And a pair of transmission gears 54 and 55 provided on a second power transmission shaft 50 provided on one side of the first power transmission shaft 20 to be connected to the power transmission shaft 50, A fourth clutch (51) (52) provided on the second power transmission shaft (50) to transmit the second clutch (51);
And the power-shift state of the vehicle.
The method according to claim 1,
3 and 4 gears 22 and 22 provided on the first power transmission shaft 20 so as to be engaged with the first and second gears 11 and 12, And a forward / reverse gear (31) and a reverse gear (32) provided so as to transmit power.
The method of claim 2,
A forward driven gear 15 for receiving the power of the forward / high gear 31 and an electric motor 15 for driving the driving shaft 10 while being spaced apart from the forward driven gear 15, And a lower gear (16) provided on the drive shaft (10) so as not to be directly transmitted and rotated at the same time as the forward driven gear (15).
The method of claim 3,
(41) and a counter drive gear (42) that are engaged with the low gear (16) and transmit power to one side of the synchronizer (40) in the periphery.
The method of claim 4,
A driven gear 53 is provided on the second power transmission shaft 50 to rotate the second power transmission shaft 50 and the third and fourth clutches 51 and 52 by engaging with the counter drive gear 42, And the power-shift state of the vehicle.
The method of claim 5,
A second power transmission shaft 50 and a pair of transmission gears 54 and 55 provided on the third power transmission shaft 23 separately from the first power transmission shaft 20, And a pair of driven gears (24) (25) for receiving the power.
The method of claim 6,
Speed select portion (60) and a negative speed change selecting portion (70) are provided on the third power transmitting shaft (23) and the fourth power transmitting shaft (26).
The method of claim 7,
A first low speed drive gear 61 is provided at one side of the ultra low speed selection unit 60 and receives power when the ultra low speed selection unit 60 is in the ON state. Speed first selection gear 60 and a second low speed second gear 63 that are rotated at the same time by receiving the power of the gear 61, Speed second driven gear (64) which is engaged with the driving gear (63) and receives power.
The method of claim 8,
Speed gear shifting gear 72 for transmitting power to the negative speed change drive gear 71 when the negative speed change selecting portion 70 is connected to the low speed position is provided at one side of the negative speed change selecting portion 70 Of the vehicle.
The method according to any one of claims 1 to 9,
And a peripheral speed actuator (110) connected to the front synchronizer (30) and the peripheral synchronizer (40) so as to operate the front and rear synchronizer (30) Transmission.

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