KR20170122609A - Hydro Mechanical Transmission - Google Patents

Abstract

The present invention relates to a hydraulic mechanical transmission, and more specifically, to a transmission structure for achieving high power transmission efficiency for a transmission device of a heavy duty work vehicle such as a tractor. According to one embodiment of the present invention, the hydraulic mechanical transmission comprises: a driving shaft (110) for receiving power from an engine; a hydro static unit (HSU) module for receiving a part of the power of the driving shaft (110) and performing a continuously variable shifting; a first planetary gear unit (200) located on the driving shaft (110) and receiving power from the driving shaft (110) and power from the HSU; a driving clutch unit (300) located on the driving shaft (110) and connected to the first planetary gear unit (200) to block or connect power flow according to a set shift mode; a second planetary gear unit (500) located on the driving shaft (110) and receiving power from the driving clutch unit (300); and an output shaft for receiving the power from the second planetary gear unit (500). The HSU is arranged to be parallel with a shaft direction of the driving shaft (110), and the first planetary gear unit (200), the driving clutch unit (300), and the second planetary gear unit (500) are sequentially located in a direction of power transmission from the driving shaft (110) to the output shaft.

Description

[0002] Hydro Mechanical Transmission [0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical hydraulic transmission, and more particularly, to a transmission structure having a high power transmission efficiency for a transmission of a heavy duty work vehicle such as a tractor.

Generally, a transmission is provided between an engine shaft that is rotated by receiving torque from an engine of a vehicle and an axle that drives a drive wheel that moves the vehicle. The transmission is provided with a stop, low speed travel, high speed travel, , And parking, it is a device that adjusts the torque and speed required when the vehicle is driven.

The transmission of the vehicle is provided with a plurality of gears having different gear teeth to implement a multi-step shifting step, for example, a shifting step from the first step to the fifth step, So that the vehicle can be operated. Various types of transmission devices have been developed and used in order to realize this. A manual transmission in which a gear is directly operated by a vehicle driver, an automatic transmission in which a gear is automatically operated in accordance with the vehicle speed, a pulley or a chain, And a continuously variable transmission.

Particularly, the continuously variable transmission (CVT) does not perform each step-variable shifting as in the first to fifth steps but allows a continuous change in speed by simply operating the accelerator within a certain range, It is advantageous that the fuel consumption rate is good because only the desired power is used in the operation of the machine. Compared to general mechanical transmission and automatic transmission, there is also an advantage in that the production cost can be reduced by reducing the number of parts.

However, the most disadvantage of the continuously variable transmission for automobiles of the present invention is that it can be applied to compact cars because of insufficient frictional force, but it is difficult to use under high load conditions such as large vehicles.

Since a working agricultural machine such as a tractor must be equipped with various working means under various working conditions and ground conditions, a continuously variable transmission that is easy to operate and convenient is needed. However, since the power transmission efficiency of the continuously variable transmission system is significantly lower than that of the mechanical transmission system, it has been mainly used in light-duty work machines or light vehicles such as lawn mowers and is not suitable for heavy-duty work machines such as tractors have.

Open Patent Publication No. 10-2000-0000112 (January 15, 2000)

It is an object of the present invention, which is devised to solve the problems of the prior art, to increase the convenience and efficiency in operation of a work machine by adopting the HSU module, which is a continuously variable transmission, We also want to provide a mechanical hydraulic transmission suitable for machines.

According to an embodiment of the present invention, a drive shaft (110) that receives power from an engine (110); An HSU (Hydro Static Unit) module that receives a part of the power of the drive shaft 110 and performs a continuously variable transmission; A first planetary gear unit 200 positioned on the drive shaft 110 and receiving power from the drive shaft 110 and power from the HSU; A drive clutch unit (300) located on the drive shaft (110) and connected to the first planetary gear unit (200) to cut off or connect the power flow according to a set shift mode; A second planetary gear unit (500) positioned on the drive shaft (110) and receiving power from the drive clutch unit (300); And an output shaft that receives power from the second planetary gear unit 500. The HSU is disposed in parallel with an axial direction of the drive shaft 110 and is disposed in the power transmission direction from the drive shaft 110 to the output shaft. The first planetary gear unit 200, the drive clutch unit 300, and the second planetary gear unit 500 are sequentially positioned.

Here, the second planetary gear unit 500 includes two sun gears 501, a sun gear 501, two sun gears 502, a short pinion 503, two long pinions 505, And a second carrier 507 and a second ring gear 508 that connect the first pinion 503 and the long pinion 505 to each other.

The braking clutch 400 may be disposed between the rear end of the driving clutch unit 300 and the second planetary gear unit 500 on the driving shaft 110 to restrict the second carrier 507.

The HSU module includes an HSU first input gear 601 and an HSU second input gear 602 located downstream of the drive shaft 110 and a first input gear 602 and an HSU second input gear 602 disposed upstream of the drive shaft 110, The output gear 603 and the HSU second output gear 604 constitute a series of gear trains.

Here, the HSU module may include a variable displacement hydraulic pump P and a fixed displacement hydraulic motor M,

The HSU module may be a swash plate type or a biaxial HSU module.

The HSU module may be characterized in that the transmission ratio is controlled by an electronic control module provided on one side of the work vehicle.

The drive clutch unit may include at least two drive clutches including a first drive clutch 301 and a second drive clutch 302 and a third planetary gear unit at the rear end of the second planetary gear unit 200 It is also possible to secure an additional shift mode including the above.

According to another embodiment of the present invention, there is provided a mechanical hydraulic transmission comprising: a drive shaft (110) that receives power from an engine; An HSU (Hydro Static Unit) module that receives a part of the power of the drive shaft 110 and performs a continuously variable transmission; A first planetary gear unit 200 positioned on the drive shaft 110 and receiving power from the drive shaft 110 and power from the HSU; A drive clutch unit 300 including a first drive clutch 301 and a second drive clutch 302 disposed on the drive shaft 110 and connected to the first planetary gear unit 200; A brake clutch 400 positioned between the rear end of the drive clutch unit 300 and the second planetary gear unit 500 on the drive shaft 110; And a second planetary gear unit (500) positioned on the drive shaft (110) and receiving power from the drive clutch unit (300). The second planetary gear unit 500 includes two sun gears and a short pinion 503, which are composed of a small sun gear 501 and a large sun gear 502, And a second ring gear 508 that connects the short pinion 503 and the long pinion 505 to each other, and a second ring gear 508 that connects the short pinion 503 and the long pinion 505 to each other. A mechanical hydraulic transmission can be provided.

As a shift method using a mechanical hydraulic type transmission according to the above-described embodiment,

The second drive clutch 302 transmits the power received from the first planetary gear unit 200 through the small sun gear 501 and the brake clutch 400 is operated to restrain the second carrier 507 The short pinion 503 is restrained by the small sun gear 501 and the long pinion 505 contacting with the short pinion 503 is also restrained and finally the power is transmitted to the second ring gear 508, Is transmitted.

The power transmitted from the first planetary gear unit 200 to the first drive clutch 301 and the second drive clutch 302 is transmitted through the large sun gear 502 and the small sun gear 501 to the second The long pinion 505 is restrained by the driving of the large sun gear 502 and the power is transmitted to the second ring gear 508 in contact with the long pinion 505, The short pinion 503 is restrained by the small sun gear 501 and the power transmitted to the short pinion 503 is transmitted to the second ring gear 508 through the long pinion 505 .

The first drive clutch 301 transmits the power from the first planetary gear unit 200 through the large sun gear 502 and the brake clutch 400 operates to rotate the second carrier 507 The long pinion 505 is constrained by the driving of the large sun gear 502 and the second ring gear 508 contacting the long pinion 505 is constrained, 508 of the first embodiment.

According to an embodiment of the present invention, the HSU module, which is a continuously variable transmission, is employed to increase convenience and efficiency in operation of a work machine, and to achieve high power transmission efficiency of a transmission by incorporating mechanical transmission means together .

In addition, the present invention is advantageous in that a combination of a series of gear trains, a drive clutch, and a brake clutch is provided with a power branching type hydraulic hydraulic transmission, and a high space efficiency can be ensured in mounting a working machine such as a tractor.

1 is a block diagram of a mechanical hydraulic transmission according to an embodiment of the present invention.
2 is an exploded perspective view of a hydrodynamic transmission according to one embodiment of the present invention.
3 is a side cross-sectional view of a hydrodynamic transmission according to one embodiment of the present invention.
4 is a front view of a mechanical hydrostatic transmission according to an embodiment of the present invention.
5 is a rear view of a mechanical hydrostatic transmission according to one embodiment of the present invention.
6 is a chart illustrating a shift mode of a mechanical hydraulic transmission according to an embodiment of the present invention.
FIG. 7 is a view showing power flow when a one-stage shift is performed using a mechanical hydraulic transmission according to an embodiment of the present invention. FIG.
FIG. 8 is a view showing power flow when a two-speed shift is performed using a mechanical hydraulic transmission according to an embodiment of the present invention.
9 is a view showing power flow when performing a reverse shift using a mechanical hydraulic transmission according to an embodiment of the present invention.

The embodiments described below are provided so that those skilled in the art can easily understand the technical idea of the present invention, and thus the present invention is not limited thereto. In addition, the matters described in the attached drawings may be different from those actually implemented as schematized drawings to easily describe embodiments of the present invention.

It is to be understood that when an element is referred to as being connected or connected to another element, it may be directly connected or connected to the other element, but it should be understood that there may be other elements in between.

The term "connection" as used herein means a direct connection or indirect connection between a member and another member, and may refer to any physical connection or electrical connection such as adhesion, attachment, fastening, bonding, and bonding.

Also, the expressions such as 'first, second, third' and the like are used only for distinguishing plural configurations, and do not limit the order or other features among the configurations.

The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The word "comprise" or "having" is used herein to mean that a feature, a number, a step, an operation, an element, a component or a combination thereof is disclosed in the specification, A step, an operation, an element, a component, or a combination thereof.

&Quot; Upstream "means a side from which power is input from one member," Downstream " means a side from which power input from one member is transmitted, and " Can be referred to as " one point "

The mechanical hydraulic transmission according to the embodiment of the present invention is characterized in that the first planetary gear unit 200, the drive clutch unit 300 and the second planetary gear unit 500 are located on the drive shaft receiving power from the engine .

The mechanical hydraulic transmission according to an embodiment of the present invention is characterized in that the power transmission path is formed by using two or more planetary gear trains and a continuously variable transmission such as an HSU (Hydro Static Unit or HST) . In some cases, three or more power transmission paths may be formed for various changes of the additional transmission or transmission packaging.

BACKGROUND ART [0002] As described above, an agricultural machine such as a tractor requires a variety of working means in various working conditions and ground conditions, and therefore, a continuously variable transmission that is easy to operate and convenient is required. However, the continuously variable transmission system composed of HSU only has low power transmission efficiency and is used mainly for light duty farming machines such as lawn mowers and is unsuitable for heavy duty farming machinery.

Accordingly, the present invention provides a Hydro Mechanical Drive Transmission (HMT) that combines the advantages of the operation of the HSU and the high power transmission efficiency of the mechanical transmission. That is, it provides a shift system that combines the hydrostatic stepless speed change of the HSU module with the mechanical shift of the gear train. Here, the hydrostatic type continuously variable shifting of the HSU module may mean a micro-shifting mainly for the riding comfort or operational convenience of the user, and the mechanical shifting of the gear train may mean shifting of the traveling mode such as low speed, high speed, have.

Hereinafter, the construction of a mechanical hydraulic transmission according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG.

1 is a block diagram of a mechanical hydraulic transmission according to an embodiment of the present invention. 2 is an exploded perspective view of a hydrodynamic transmission according to one embodiment of the present invention. 3 is a side cross-sectional view of a hydrodynamic transmission according to one embodiment of the present invention.

A mechanical hydraulic transmission according to an embodiment of the present invention includes a drive shaft 110 receiving power from an engine; An HSU (Hydro Static Unit) module that receives a part of the power of the drive shaft 110 and performs a continuously variable transmission; A first planetary gear unit 200 positioned on the drive shaft 110 and receiving a part of power from the drive shaft 110 and a part of the power from the HSU; A drive clutch unit (300) connected to the first planetary gear unit (200) for interrupting or connecting the power flow according to a set shift mode; A second planetary gear unit 500 for receiving power from the drive clutch unit 300; And an output gear 130 receiving power from the second planetary gear unit 500.

The HSU first input gear 601 and the HSU second input gear 602 located downstream of the driving shaft 110 and the HSU second input gear 602 located upstream of the driving shaft 110 The HSU first output gear 603 and the HSU second output gear 604, which are located on the gear train. More specifically, the configuration of the HSU module includes an HSU input shaft 610 for transmitting power from the hydraulic pump P and the hydraulic motor M to the hydraulic pump P from the HSU second input gear 602, And an HSU output shaft 610 'for transmitting power from the first output gear M to the HSU first output gear 603.

Referring to FIGS. 2 and 3, the HSU input shaft 610 is a shaft having a predetermined length, one end of which is supported by a separate HSU center jig 102 and the other end is supported by the HSU cover 101 Lt; / RTI > 2 and 3, the configuration of the HSU output shaft 610 'may be a shaft configuration having a predetermined length, such as the HSU input shaft 610. [ The configuration of the HSU input shaft 610 and the HSU output shaft 610 'may be varied in size and shape according to the mounting concept of the actual agricultural machine working vehicle and may include a jig for supporting the HSU input shaft 610 and the HSU output shaft 610' The overall shape of the transmission housing structure including the case is also freely deformable.

In the HSU module according to an embodiment of the present invention, the hydraulic pump P may be a variable displacement hydraulic pump and the hydraulic motor M may be a fixed displacement hydraulic motor. The variable capacity method includes a swash plate type in which the pressure fluid flows through the control block provided between the hydraulic pump and the hydraulic motor and changes the volume of the hydraulic pump through the swash plate adjustment of the swash plate provided at one side of the hydraulic pump, A diaphragm type which changes the volume of the hydraulic pump by varying the slope of the hydraulic pump, or the like. In the present invention, the swash plate type is preferable because the HSU module is formed substantially parallel to the drive shaft, but the biaxial type is not impossible in some cases. The swash plate type or boss type method has an advantage that the internal structure is simple and there is no shift shock because the continuously variable transmission is performed due to the volume change of the hydraulic pump. The speed ratio control of the HSU module may be performed by an electronic control module provided on one side of the work vehicle.

In particular, according to one embodiment, the slope of the swash plate or the slope of the bossable yoke may be actively controlled by monitoring the HSU control block in relation to the change in the volume of the hydraulic pump. 1 to 3, the HSU module of the present invention employs a series-type HSU module in which the hydraulic pump P and the hydraulic motor M are located on the same axis but not in parallel with each other. . In the mechanical hydraulic transmission (HMT), the HSU modules share rotational axes in the same direction and are designed so as to be in a direction parallel to the rotational axis of the first planetary gear unit 200 and the like, while the power transmission paths of the HSU module and the planetary gear train are different. , There is an advantage that the HMT can be packaged compactly.

The operation principle of the HSU module of the present invention is such that after a part of the power transmitted from the engine is branched to the HSU module, the volume of the hydraulic motor is changed by changing the volume of the hydraulic pump, So that the same torque can be generated. The generated torque is transmitted to the first planetary gear unit 200 (hereinafter, referred to as " first planetary gear unit ") located upstream of the drive shaft 110 in accordance with the operation flow that flows to the HSU output shaft 610 '-> the HSU first output gear 603 -> the HSU second output gear 604 .

Further, the first planetary gear unit 200 of the present invention combines the power transmitted from the HSU second output gear 604 and the power transmitted from the drive shaft 110 to the drive clutch unit 300. The combined driving force through the first planetary gear unit 200 is output to the traveling transmission apparatus (not shown) by the hydrostatic stepless speed change operation by the HSU module and is transmitted to the traveling apparatus from the traveling transmission apparatus (not shown) There is an advantage that the traveling device can be smoothly shifted and driven only by shifting the module.

Here, the power from the drive shaft 110 provided separately from the power by the hydrostatic stepless speed change can be provided through the input gear 121 shown in Fig. The input gear 121 transmits a portion of the power provided from the engine to the first carrier 204 via the first input carrier gear 122, the input carrier gear shaft 123, and the second input carrier gear 124 . The number of teeth of the input carrier gear 122, the input carrier gear shaft 123 and the second input carrier gear 124 can be adjusted according to the specification of the working vehicle and transmitted to the first planetary gear unit 200 There is an advantage.

First, the first power input (input) from the engine is branched in the direction of the input gear 121 and the HSU module, and the divided power is subjected to the step-variable shifting process using the HSU module, (200), and eventually outputted through a mechanical shifting process by a second planetary gear unit (500), which will be described later. Therefore, in the present invention, it is possible to provide a hybrid transmission of a hybrid type that combines a mechanical transmission for easy and convenient operation and a high speed transmission efficiency.

The construction of the mechanical hydraulic transmission (HMT) of the present invention will be described in more detail with reference to Fig. According to one embodiment, the transmission case 100 is provided and the HSU second output gear 604, the first planetary gear unit (the second planetary gear unit) 200, the drive clutch portion 300, the braking clutch 400, the second planetary gear portion 500, and the HSU first input gear 601 can be arranged in a series of configurations. Further, the input gear 121 is provided at the front end or the rear end of the HSU second output gear 604 on the drive shaft 110, so that the power initially supplied from the engine can be branched.

The transmission case 100 can accommodate shift elements such as the HSU module of the present invention and the first planetary gear unit 200, the driving clutch unit 300, the braking clutch unit 400, the second planetary gear unit 500, It is a component. When the transmission elements are assembled in the transmission case 100, the transmission case 100 has a hollow interior for assembling the transmission elements, and when the transmission elements are assembled in the transmission case 100, Tightly. The mission case 100 and the mission cover 101 must be tightly coupled with each other by a fastening mechanism such as a bolt and may be various sealing members for protecting the components housed therein from the inflow of external foreign matter such as rainwater It can be sealed.

 Jigs 102 and 103 may further be provided inside the mission case 100 to firmly support the structures of the drive shaft 110, the HSU module, and the HSU output shaft 610. The jigs 102 and 103 may again include a central jig 102 and a front jig 103. The central jig 102 is an essential component of the present invention and supports the HSU module, It is possible to firmly support the structure of any one or more of the planetary gear units 200 and 500 or the drive clutch unit 300 arranged in parallel. 3, the central jig 102 supports the HSU module and the driving clutch part 300 in parallel to protect the gear train and the HSU module from vibration during shifting. A bearing is inserted in the center jig 102 to support a portion connected to the HSU module and the gear train. 3, a front jig 103 supporting a shaft extending from the HSU hydraulic motor side is provided, but in some cases, the front jig 103 may be formed integrally with the mission case 100. As a further embodiment, a configuration in which a bearing is not provided in the mission cover 101 and a rear jig (not shown) is formed to support the HSU input shaft is also included in the scope of the present invention.

Further, according to an embodiment of the present invention, a first support step 104 supporting the HSU module and a second support step 105 supporting the central jig 102 may be further provided. The HSU module of the present invention may be one in which the variable displacement type hydraulic pump and the fixed displacement type hydraulic motor are formed in a serial type and the axial vibration of the HSU module is largely caused in the process of changing the script of the swash plate . In the present invention, the vibration of the HSU module can be further minimized by providing the first support step 104 separately from the front jig 103 supporting the shaft extending from the HSU hydraulic motor side. The second support step 105 supports the center jig 102 of the present invention. The second support step 105 firmly supports the center jig 102 in the process of assembling the HMT transmission elements in order, The stability can be improved. According to one embodiment, the second support step 105 may be configured to protrude in an annular ring shape along the inner circumference of the mission case 100.

The drive shaft 110 of the present invention has a predetermined length and transmits a driving force input from an engine to an output shaft. Here, the output shaft can be divided into a motive power output shaft (wo) and a power take-off output shaft (PTO). The motive power output shaft wo may be an output shaft for transmitting power for driving a working vehicle wheel and the power takeoff output shaft PTO may be an output shaft for drawing power required for driving a work crane such as a tractor . Since the tractor must operate not only forward and backward but also the working machine, the engine power is selectively received from the HMT configuration of the present invention, and the power take-off (PTO) is possible.

In addition, in one embodiment of the present invention, the driving shaft 110 is configured to be able to rotate about an axis by receiving power from the engine, and is fixed to the structures disposed on the driving shaft 110 or supported by various bearing configurations Configuration. For example, the drive shaft 110 is formed to penetrate the center of the input gear 121, the HSU second output gear 604, the first planetary gear unit 200, and the second planetary gear unit 500, And the first planetary gear unit 200 and the second planetary gear unit 500 are supported by a rolling support. The bearings 112, 206, 611, 612 and 613 of the present invention are supported by the tapered roller bearings to firmly support the drive shaft 110 or the HSU input shaft 610 'or the HSU output shaft 610 It is possible.

Next, the first planetary gear unit 200, the drive clutch unit 300, and the second planetary gear unit 500 according to an embodiment of the present invention will be described in detail.

The first planetary gear unit 200 located upstream of the drive shaft 110 includes a first sun gear 201, a first planetary gear pinion 202, a first carrier (not shown) that connects the plurality of first planetary gear pinions 202 204 and a first ring gear 205 wherein the first planetary gear pinion 202 is circumscribed and engaged with the first sun gear 201 and the first ring gear 205 is meshed with the first sun gear 201, And is engaged externally with the planetary gear pinion 202. The pinion gear pin 203 can be fitted in the shaft center of each first planetary gear pinion 202 so that the first planetary gear pinion 202 can rotate, A first planetary gear bearing 206 may be provided on one side so as to be smoothly rotated on the first planetary gear unit.

The drive clutch unit 300 located at the middle of the drive shaft 110 may be constituted by a plurality of drive clutches other than a single drive clutch for intercepting or connecting the power flow transmitted from the first planetary gear unit 200. [ For example, as shown in FIG. 1, the drive clutch unit 300 according to an embodiment of the present invention includes a first drive clutch 301 and a second drive clutch 302 (Rr. Clutch) . However, the third drive clutch, the fourth drive clutch, ..., the n-th drive clutch (n: natural number) may be additionally provided in some cases in order to realize more various shift mechanisms Of course.

The second planetary gear unit 500 located on the downstream side of the drive shaft includes two sun gears constituted by a small sun gear 501 and a large sun gear 502 and two pinions composed of a short pinion 503 and a long pinion 505, And a second carrier 507 and a second ring gear 508 that connect the short pinion 503 and the long pinion 505 to each other. Here, the small sun gear 501 and the large sun gear 502 can be disposed on substantially the same axis line, and the small sun gear 501 is connected to the short pinion 503, the large sun gear 502 is connected to the long pinion 505, The short pinion 503 is meshed with the long pinion 505 and the long pinion 505 is meshed with the second ring gear 508. [

That is, the second planetary gear unit 500 according to an embodiment of the present invention can be formed as a rabbinic planetary gear set composed of two sun gears, two pinions and one carrier, and one ring gear. The Ravigneaux planetary gears have the effect of obtaining a high gear ratio by connecting a plurality of planetary gears in series as if the long pinions 505 are commonly used in a plurality of shift modes, The number of necessary pinions can be reduced by one, and the number of the entire components can be reduced, and the axial length (or volume) of the entire planetary gear unit can be reduced by reducing the number of components.

According to an embodiment of the present invention, gear elements of the second planetary gear unit 500 are connected to or disconnected from each other through the selective operation of the drive clutch unit 300 and the braking clutch 400, . ≪ / RTI > Of course, the HSU module described above allows the user to make fine shifts.

Some configurations of the first planetary gear unit 200 and the second planetary gear unit 500 as described above may adopt a cluster gear type to improve the durability of the entire planetary gear train. The target output and the rotational speed can be variously set according to the embodiment, and the specific tooth profile of the planetary gear train and its detailed description will be omitted.

In various prior arts which have been disclosed in the prior art, a transmission is constituted by complexly combining a gear configuration, a drive clutch and a brake clutch to obtain various shift modes and necessary shift efficiency. In the present invention, the power split by the first planetary gear unit 200 can be synthesized, and the synthesized power is restricted through the drive clutch and the braking clutch disposed at the rear end of the first planetary gear unit 200, There are advantages to be able to. Here, the drive clutch and the brake clutch structure are configured to be supported through the intermediate jig 102 as shown in FIG. 3, thereby effectively absorbing the shift shock and reducing vibration and noise. The present invention is advantageous in that it has a compact structure as a whole and is excellent in work stability and is easy to satisfy the torque and RPM performance requirements of the working vehicle A mechanical hydraulic transmission can be provided.

Next, the power flow according to the shift mode and each shift mode according to an embodiment of the present invention will be described with reference to FIG. 6 to FIG.

6 is a chart illustrating a shift mode of a mechanical hydraulic transmission according to an embodiment of the present invention.

The shift mode of the present invention can be largely selected as the first, second, and reverse modes as shown in FIG. This is an example of mechanical shifting, which is related to the connection and disconnection between the second planetary gear unit 500 and the gear elements included in the drive clutch unit 300 and the brake clutch 400 described above. The present invention is different from the conventional mechanical transmission in that it can carry out continuously variable shifting for fine operation using the HSU module in the previous stage of the mechanical shifting for setting the shift mode.

Stage mode of mechanical shifting represents an operation mode when the second drive clutch 302 (Rr. Clutch) and the brake clutch 400 are applied, and the second-stage mode represents the operation mode when the first drive clutch 301, Fr.Clutch Indicates the operating mode when the second drive clutch 302 (Rr. Clutch) is applied. The reverse mode indicates the operating mode when the first drive clutch (301, Fr.Clutch) and the brake clutch (400) are applied.

FIG. 7 is a view showing power flow when a one-stage shift is performed using a mechanical hydraulic transmission according to an embodiment of the present invention. FIG.

7, the one-stage shifting operation is performed in such a manner that the second drive clutch 302 is connected to the first ring gear 205 of the first planetary gear unit 200 so that the power from the first planetary gear unit 200 Is transmitted through the small sun gear 501 of the second planetary gear unit 500 and the second carrier 507 of the second planetary gear unit 500 is fixed by fixing the braking clutch 400. [ As the small sun gear 501 is driven, the short pinion 503 is restrained and the long pinion 505 contacting with the short pinion 503 is also restrained so that the power is finally transmitted to the second ring gear 508. Consequently, the small sun gear 501 serves as a driving gear, and the second ring gear 508 serves as a driven gear.

At this time, the power flow output through the first ring gear is transmitted through the first ring gear 205, the second drive clutch 302, the small sun gear 501, the short pinion 503, and the long pinion 505, - > second ring gear 508 - > output shaft.

In the case of a general planetary gear device, when the sun gear serves as a driving gear under the condition that the carrier is fixed and the ring gear serves as the driven gear, the result of reverse deceleration is derived. However, as in the present embodiment, The result of forward rotation deceleration is output in the Lavinia type planetary gear set in contact with the pinion 503 and the short pinion 503 in contact with the long pinion 505 and the long pinion 505 in contact with the second ring gear 508 .

FIG. 8 is a view showing power flow when a two-speed shift is performed using a mechanical hydraulic transmission according to an embodiment of the present invention.

8, in the two-speed shifting operation, the first drive clutch 301 and the second drive clutch 302 are simultaneously connected to the first ring gear 205 of the first planetary gear unit 200, The power transmitted from the planetary gear unit 200 is transmitted to the second ring gear 508 through the large sun gear 502 and the small sun gear 501 of the second planetary gear unit 500, respectively. As the large sun gear 502 is driven, the long pinion 505 is restrained thereby, and the power is transmitted to the second ring gear 508, which is in contact with the long pinion 505. The two sun gears 501 are also driven so that the short pinion 503 is restrained and the power transmitted to the short pinion 503 is transmitted to the second ring gear 508 through the long pinion 505 do. Consequently, the large sun gear 502 and the small sun gear 501 serve as drive gears, and the second ring gear 508 serves as a driven gear. The speed of the second ring gear 508 in the two-speed transmission can be increased as compared with the one-speed shift because the power transmitted from the large sun gear 502 and the small sun gear 501 is output unlike the single speed shift.

At this time, the power flow output through the first ring gear 205 is transmitted through the first ring gear 205, the first drive clutch 301, the long sun gear 502, the long pinion 505, The ring gear 508 to the output shaft and the first ring gear 205 to the second drive clutch 302 to the small sun gear 501 to the short pinion 503 to the long pinion 505, The operation of the second ring gear 508 -> the output shaft can be simultaneously developed.

9 is a view showing power flow when performing a reverse shift using a mechanical hydraulic transmission according to an embodiment of the present invention.

9, the backward operation is performed such that the first drive clutch 301 is connected to the first ring gear 205 of the first planetary gear unit 200 to disengage the power from the first planetary gear unit 200 2 through the large sun gear 502 of the planetary gear unit 500. At this time, the second carrier 507 of the second planetary gear unit 500 is restrained and fixed by operating the brake clutch 400. [ As the large sun gear 502 is driven, the long pinion 505 is restrained thereby, and the second ring gear 508, which is in contact with the long pinion 505, is restrained, so that power is finally transmitted to the second ring gear 508 do. Consequently, the large sun gear 502 serves as a driving gear, and the second ring gear 508 serves as a driven gear.

At this time, the power flow output through the first ring gear 205 is transmitted through the first ring gear 205, the first drive clutch 301, the long sun gear 502, the long pinion 505, Ring gear 508 - > output shaft.

Under the condition that the carrier is fixed, when the sun gear serves as a driving gear and the ring gear serves as a driven gear, reverse rotation decelerates, resulting in a backward movement.

In addition to the above-described embodiment, the present invention further includes an additional planetary gear unit at the rear end of the second planetary gear unit 500, so that it is possible to perform fine shifting in three stages, four stages, ..., n stages (n: natural number). For example, an additional shift such as the third or fourth step may be achieved by arranging a third planetary gear unit (not shown) in series on the same drive shaft 110 at the rear end of the second planetary gear unit 500, It can be implemented simply.

According to the embodiment of the present invention as described above, the HSU module, which is a continuously variable transmission, is adopted to increase convenience and efficiency in operation of a work machine, and to achieve high power transmission efficiency of the transmission by incorporating mechanical transmission means There is an effect that can be.

In addition, the present invention is advantageous in that a combination of a series of gear trains, a drive clutch, and a brake clutch is provided with a power branching type hydraulic hydraulic transmission, and a high space efficiency can be ensured in mounting a working machine such as a tractor.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

The scope of the present invention is defined by the appended claims rather than the foregoing description, and all changes or modifications derived from the meaning and scope of the claims and equivalents thereof are deemed to be included in the scope of the present invention. .

100: mission case
101: Mission cover
102, 103: jig
110: drive shaft
111: Oil pump
112: PTO shaft bearing
113: PTO shaft snap ring
121: Input gear
122: first input carrier gear
123: Input carrier shaft
124: second input carrier gear
130: Output gear
200: First planetary gear unit
201: 1st sun gear
202: first planetary gear pinion
203: first planetary gear pinion gear pin
204: first carrier
205: first ring gear
300: drive clutch part
301: first drive clutch
302: second drive clutch
400: Braking clutch
500: Second planetary fisherman
501: Small sun gear
502: Large sun gear
503: Short pinion
504: Short pinion pin
505: Large pinion
506: Large pinion pin
507: second carrier
508: second ring gear
509: Ring gear output gear
601: HSU 1st input gear
602: HSU 2nd input gear
603: HSU 1st output gear
604: HSU 2nd output gear
610: HSU input shaft
610 ': HSU output shaft
611, 612, 613: HSU bearings

Claims (13)

In a mechanical hydraulic transmission,
A driving shaft (110) receiving power from the engine;
An HSU (Hydro Static Unit) module that receives a part of the power of the drive shaft 110 and performs a continuously variable transmission;
A first planetary gear unit 200 positioned on the drive shaft 110 and receiving power from the drive shaft 110 and power from the HSU module;
A drive clutch unit (300) located on the drive shaft (110) and connected to the first planetary gear unit (200) to cut off or connect the power flow according to a set shift mode;
A second planetary gear unit (500) positioned on the drive shaft (110) and receiving power from the drive clutch unit (300);
And an output shaft receiving power from the second planetary gear unit (500)
The HSU module is disposed in parallel to the axial direction of the drive shaft 110,
Wherein the first planetary gear unit (200), the drive clutch unit (300), and the second planetary gear unit (500) are sequentially positioned in the power transmission direction from the drive shaft (110) to the output shaft.
The method according to claim 1,
The second planetary gear unit 500 includes two sun gears constituted by a small sun gear 501 and a large sun gear 502 and two pinions composed of a short pinion 503 and a long pinion 505, And a second carrier (507) and a second ring gear (508) connecting the long pinion (505) with each other.
3. The method of claim 2,
And is disposed between the rear end of the driving clutch part 300 and the second planetary gear part 500 on the driving shaft 110,
Further comprising a braking clutch (400) for restricting the second carrier (507).
The method according to claim 1,
The HSU module includes an HSU first input gear 601 and an HSU second input gear 602 located downstream of the drive shaft 110 and an HSU first output gear 603 disposed upstream of the drive shaft 110, HSU second output gear (604) is located between a series of gear trains constituting the HSU second output gear (604).
5. The method of claim 4,
Wherein the HSU module includes a variable displacement hydraulic pump (P) and a fixed displacement hydraulic motor (M).
6. The method of claim 5,
Wherein the HSU module is a swash plate type HSU module.
6. The method of claim 5,
Wherein the speed ratio of the HSU module is controlled by an electronic control module provided on one side of a work vehicle.
The method according to claim 1,
Wherein the drive clutch unit comprises at least two drive clutches including a first drive clutch (301) and a second drive clutch (302).
The method according to claim 1,
And a third planetary gear unit for further shifting to the rear end of the second planetary gear unit (500).
In a mechanical hydraulic transmission,
A driving shaft (110) receiving power from the engine;
An HSU (Hydro Static Unit) module that receives a part of the power of the drive shaft 110 and performs a continuously variable transmission;
A first planetary gear unit 200 positioned on the drive shaft 110 and receiving power from the drive shaft 110 and power from the HSU module;
A drive clutch unit 300 including a first drive clutch 301 and a second drive clutch 302 disposed on the drive shaft 110 and connected to the first planetary gear unit 200;
A brake clutch 400 positioned between the rear end of the drive clutch unit 300 and the second planetary gear unit 500 on the drive shaft 110; And
A second planetary gear unit (500) positioned on the drive shaft (110) and receiving power from the drive clutch unit (300); And an output shaft receiving power from the second planetary gear unit (500)
The second planetary gear unit 500 includes two sun gears constituted by a small sun gear 501 and a large sun gear 502 and two pinions composed of a short pinion 503 and a long pinion 505, And a second carrier (507) and a second ring gear (508) connecting the long pinion (505) with each other.
A shift method of a mechanical hydraulic transmission using the mechanical hydraulic transmission according to claim 10,
The second drive clutch 302 transmits the power received from the first planetary gear unit 200 through the small sun gear 501 and the brake clutch 400 is operated to restrain the second carrier 507 Respectively,
The short pinion 503 is restrained by the small sun gear 501 and the long pinion 505 contacting with the short pinion 503 is restrained so that the power is finally transmitted to the second ring gear 508 Characterized in that the transmission of the machine hydraulic transmission is shifted.
A shift method of a mechanical hydraulic transmission using the mechanical hydraulic transmission according to claim 10,
The power transmitted from the first planetary gear unit 200 to the first drive clutch 301 and the second drive clutch 302 is transmitted to the second planetary gear unit 200 via the second sun gear 501 and the second sun gear 502, Lt; RTI ID = 0.0 > 508,
As the large sun gear 502 is driven, the long pinion 505 is restrained and the power is transmitted to the second ring gear 508 contacting the long pinion 505. At the same time, the small sun gear 501 is driven And the power transmitted to the short pinion 503 is finally transmitted to the second ring gear 508 through the long pinion 505. The mechanical transmission of the present invention is characterized in that the short pinion 503 is constrained to the short pinion 503, Shift method.
A shift method of a mechanical hydraulic transmission using the mechanical hydraulic transmission according to claim 10,
The first drive clutch 301 transmits the power from the first planetary gear unit 200 through the large sun gear 502 and the brake clutch 400 operates to restrain the second carrier 507 Fixed,
The long pinion 505 is constrained by the driving of the large sun gear 502 and the second ring gear 508 contacting with the long pinion 505 is constrained so that the power is finally supplied to the second ring gear 508 And the hydraulic pressure is transmitted to the hydraulic pump.

Images