KR101807248B1 - Transfer Case - Google Patents

Abstract

The present invention relates to a transfer case capable of operating a working device through driving power of a traveling engine. According to the present invention, the transfer case comprises: a housing; an input shaft installed in the housing to be able to rotate and receiving driving power from an engine to be rotated; an idle shaft installed to the housing to receive the driving power from the input shaft so as to be rotated; a traveling shaft installed in the housing to be able to rotate in order to receive rotational force of the idle shaft so as to transfer power to a driving wheel of a vehicle; a first power transfer unit transferring driving power of the input shaft to the idle shaft and selecting a high or lower speed mode to transfer power; a second power transfer unit connected to an ultralow speed output shaft connected to the input shaft to transfer power in order to operate the idle shaft in an ultralow speed mode; and an oil pumping gear part to pump and supply oil in a lower part of the housing towards an upper part of the housing through the rotational force of the idle shaft.

Description

Transfer case {Transfer Case}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer case, and more particularly, to a transfer case which can easily select a high-speed, low-speed, and ultra-low-speed running for an operation and which is easy to supply oil for cooling and lubrication of a power transmission system .

In general, a four-wheel drive vehicle can transmit power even if the driving force of one wheel is lost during rough driving, and it is possible to drive without difficulty even on snowy roads and sandy roads. In addition, it improves correspondence ability according to the change of center of gravity during severe hill or downhill driving, improves tire grip on slippery road surface with 4 wheel torque distribution, improves straightness and safety of cornering when turning by 4 wheel torque distribution is rapid .

In order to understand the characteristics of the four-wheel drive as described above, the transfer case is the most basic thing to know. The transfer case is a front-rear wheel drive transmission device for driving four-wheel drive and another transmission provided in addition to the transmission.

The transfer case is a mechanical device in which gears for driving the front and rear wheels are formed in a case made of cast iron or aluminum. The power transmitted from the engine and the transmission is transmitted to the rear wheel, and the front wheel drive shaft and the front wheel axle To the front wheels.

In addition, in the case of a working vehicle such as snow removal, weeding, cleaning, and the like, the transfer case is used to transmit the driving force of the engine to wheels. Conventionally, the driving force of the engine can be used only as a power source for running the vehicle. There is a problem in that a separate power source is additionally mounted to drive the working device, and thus the cost of installing a separate power source is high, and the efficiency is low.

Further, various shafts, bearings, and gears for power transmission are installed in the transfer case. However, the parts of the power transmission system mounted on the upper side of the transfer case have a problem in that oil supply for lubrication and cooling is not easy.

Japanese Patent Application Laid-Open No. 10-2014-0068467: Transfer case for four-wheel drive vehicle

It is an object of the present invention to provide a transfer case in which lubricating oil for cooling and lubrication can be easily supplied to power transmission parts inside a transfer case.

It is another object of the present invention to provide a transfer case which can transfer driving power of a working device as well as driving of a vehicle through a driving force of an engine during a special-purpose vehicle for driving at a very low speed.

The transfer case according to the present invention includes a housing, an input shaft rotatably installed in the housing, the input shaft rotating to receive a driving force from the engine, an idle shaft provided in the housing to rotate by receiving a driving force from the input shaft, A driving driving shaft rotatably installed in the housing to transmit power to a driving wheel of the vehicle in response to a rotational force of the shaft and a driving force of the input shaft being transmitted to the idle shaft to select a high speed mode and a low speed mode, A second power transmitting unit connected to the input shaft and connected to an ultra low speed output shaft for transmitting the power to drive the idle shaft in the ultra low speed mode; and a second power transmitting unit provided on the idle shaft, The oil in the lower portion of the housing is pumped to the upper side of the housing, Which is connected to the ultra-low speed output shaft and which pumps the fluid while the second power transmission unit is in operation and transmits the fluid to the working device when the power of the input shaft is transmitted to the second power transmission unit, And a hydraulic pump.

The first power transmission unit is detachably connected to the input shaft and includes a high-speed transmission unit for transmitting the driving force of the input shaft to the idle shaft for traveling in the high-speed mode, And a low-speed transmission portion for transmitting a driving force of the input shaft to the idle shaft for traveling, and a selective connection portion for selectively connecting the power of the input shaft to the high-speed transmission portion, the low- .

The second power transmission unit includes a first hydraulic pump connected to the ultra-low speed output shaft for pumping the fluid in the hydraulic tank through a power transmitted by the ultra low speed output shaft, and a second hydraulic pump driven by the fluid pumped by the first hydraulic pump. And a sub power transmission portion for transmitting power generated by the hydraulic motor to the idle shaft.

The sub power transmission portion includes a sub shaft provided in the housing so as to be rotatable by the hydraulic motor, a driving gear coupled to the sub shaft and rotated together with the sub shaft, And an idle gear rotatably installed on the housing so as to be engaged with the driven gear.

Wherein the high-speed transmission portion includes a first input gear connected to the input shaft by the selection connection portion or provided so as to be rotatable relative to the input shaft so that the connected state can be released from the input shaft, And a first driven gear provided on the shaft.

Wherein the low speed transmission portion includes a second input gear connected to the input shaft by the selective connection portion or installed to be rotatable relative to the input shaft so as to be released from the input shaft, And the second input gear and the second driven gear are formed such that the gear ratio is larger than the gear ratio of the first input gear and the first driven gear.

Wherein the driving driving shaft is connected to a front transmission shaft for transmitting a driving force to a front wheel of the vehicle and connected to a rear transmission shaft for transmitting a driving force to the rear wheel of the vehicle, And a rear drive shaft rotatably installed in the housing, wherein the differential unit divides the driving force transmitted from the idle shaft into the front drive shaft and the rear drive shaft.

Wherein the differential unit includes a drive gear which is engaged with the first driven gear and is provided so as to be rotatable relative to the front drive shaft and a drive gear which is connected to or connected to the front drive shaft so as to rotate together with the front drive shaft, And an output clutch for transmitting a drive force from the drive gear to the rear drive shaft when the drive clutch is disengaged from the front drive shaft by the output clutch, And a planetary gear unit for transmitting a driving force of a magnitude different from the driving force transmitted to the driving shaft to the rear driving shaft.

At least one planetary gear mounted rotatably on the carrier at a position spaced apart from a center of rotation of the front drive shaft, and at least one planetary gear mounted on an end of the rear drive shaft A ring gear having a hollow formed therein for receiving an end portion of the planetary gear and the front drive shaft and having a plurality of gears formed on an inner circumferential surface of the planetary gear so as to engage with the planetary gear, And a sun gear fixed to an end of the front drive shaft which is opposed to the sun gear.

The transfer case according to the present invention is capable of driving a vehicle and driving a working device through a driving force of an engine for driving a vehicle without a separate power source for driving a working device of a special-purpose vehicle such as snow removal, weeding, There is an advantage that the manufacturing cost can be lowered and maintenance can be facilitated as compared with the case where the engine for the apparatus is separately provided.

1 is a perspective view of an embodiment of a transfer case according to the present invention,
Fig. 2 is a side view of the transfer case of Fig. 1,
3 is a side sectional view of the transfer case of Fig. 1,
4 is a side sectional view showing another embodiment of the transfer case further comprising an oil pump unit connected to the idle shaft,
Fig. 5 is a front view of the transfer case including the oil pump unit of Fig. 4,
6 is a front view showing the sub power transmission portion of the second power transmission unit,
7 to 9 are conceptual diagrams showing the flow of power transmission to the high speed mode, the low speed mode and the ultra low speed mode of the transfer case of the present invention, respectively.

Hereinafter, a transfer case according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention in order to clarify the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 to 3, a transfer case 10 according to the present invention includes a housing 100 installed in a vehicle, a housing 100 installed to be rotatably installed in the housing 100 for receiving driving force from the engine, An idle shaft 300 installed in the housing 100 for receiving driving force from the input shaft 200 to rotate and an idle shaft 300 connected to the idle shaft 300 for driving the vehicle, A differential unit 500 for distributing the driving force transmitted from the idle shaft 300 to the front driving shaft 410 and the rear driving shaft 420 constituting the driving driving shaft 400, A second power transmitting unit 700 for transmitting the driving force of the input shaft 200 to the idle shaft 300 and a second power transmitting unit 700 for transmitting the driving force of the operating device 910 when the traveling wheels are driven through the second power transmitting unit 700 A second hydraulic pump 900 for supplying a fluid for the first hydraulic pump 900, .

The housing 100 is installed in the vehicle and includes an input shaft 200, an idle shaft 300, a driving drive shaft 400, a differential unit 500, a first power transmission unit 600, And an inner space for installing the battery 700 is provided.

The input shaft 200 extends in the front-rear direction, and the front and rear ends of the input shaft 200 pass through the housing 100 and are rotatably supported by the housing 100. The front end of the input shaft 200 is provided with a flange for coupling an output unit (not shown) connected to the transmission of the engine. The flange is formed to have an outer diameter larger than the outer diameter of the input shaft 200. A plurality of fastening holes are formed to be fastened to the output portion. An output shaft extending from the transmission is connected to the input shaft 200 .

The idle shaft 300 is installed inside the housing 100 at a position spaced downwardly with respect to the input shaft 200, and both ends thereof are rotatably supported by the housing 100. The idle shaft 300 preferably extends in the front-rear direction in parallel with the input shaft 200.

As shown in FIGS. 4 and 5, the idle shaft 300 may further include an oil pump unit 310.

The oil pump unit 310 pumps the lubricating oil in the lower portion of the housing 100 to the upper side of the housing 100 to thereby dissipate heat and lubricate the shafts and gears for power transmission installed on the upper side of the housing 100 .

The oil pump unit 310 includes a pump case 311 and a pump gear 312 installed inside the pump case 311 and connected to the idle shaft 300 to pump the oil.

The pump gear 312 includes a drive rotor 313 coupled to the idle shaft 300 and rotating together with the idle shaft 300 and gear teeth formed on the inner peripheral surface of the drive rotor 313 so as to mesh with each other, And a driven rotor 314 rotatably supported by the case 311, and the pump gear 312 pumps the lubricating oil.

Since the pump gear 312 is the same in operation principle as a conventional rotor type oil pump, detailed description is omitted.

When the idle shaft 300 rotates, the pump gear 312 connected to the idle shaft 300 moves the oil hose extending to the lower portion of the housing 100 toward the inlet port 315 of the compressor case 311 And the lubricant is discharged through the discharge port 316. The discharged lubricating oil is supplied to the upper side of the housing 100 through the oil hose and oil is supplied to the shaft and the gears from the upper side of the housing 100 to flow to the lower portion of the housing 100 while performing the heat dissipation and lubricating action It goes down.

In this way, in the present embodiment, when the idle shaft 300 is operated, the oil on the lower side of the housing 100 is automatically pumped upward, so that the heat dissipation and lubricating action of the driving devices for power transmission can be facilitated.

The driving drive shaft 400 is installed inside the housing 100 at a position spaced downwardly with respect to the idle shaft 300 and includes a front driving shaft 410 extending forwardly of the housing 100, And a rear drive shaft 420 extending rearwardly.

The front drive shaft 410 is for transmitting the driving force to the front wheels of the vehicle and extends to the front of the housing 100 and protrudes out of the housing. The rear drive shaft 420 is disposed at a position spaced rearward relative to the front drive shaft 410 And a rear end of the housing 100 is rotatably supported through the housing 100. The rear drive shaft 420 may be installed in the housing 100 such that the center of rotation of the rear drive shaft 420 is located on the rotational center line of the front drive shaft 410.

 The differential unit 500 includes a drive gear 510 coupled to the first driven gear 612 of the first power transmission unit 600 and configured to be rotatable relative to the forward drive shaft 410, An output clutch 520 for connecting the front drive shaft 410 to the front drive shaft 410 or releasing the connection state from the front drive shaft 410 to rotate together with the front drive shaft 410 according to a driver's selection, When the drive gear 510 is disconnected from the front drive shaft 410 by the output clutch 520, the rear drive shaft 420 (see FIG. 4) The planetary gear unit 530 transmits a driving force of a magnitude different from that of the driving force transmitted to the front driving shaft 410.

A plurality of gear teeth are formed on the outer circumferential surface of the drive gear 510 so as to engage with the first driven gear 612. The through-hole may be formed to have an inner diameter larger than an outer diameter of the front drive shaft 410 so that the drive gear 510 can be relatively rotatably mounted on the front drive shaft 410.

The output clutch 520 is installed between the front drive shaft 410 and the drive gear 510 and selectively connects the drive gear 510 to the front drive shaft 410. The output clutch 520 may be a conventionally used dog clutch, and a detailed description thereof will be omitted.

The planetary gear unit 530 includes a carrier 531 connected to the drive gear 510 and rotating with the drive gear 510 and a carrier 531 disposed at a position spaced from the rotation center of the forward drive shaft 410 A planetary gear 532 disposed at an end of the rear drive shaft 420 and formed with a hollow to receive an end of the planetary gear 532 and the front drive shaft 410, A ring gear 533 having a plurality of gear teeth formed therein so as to be engaged with the planetary gear 532 and a ring gear 533 fixed to the end of the front drive shaft 410 facing the planetary gear 532 so as to be engaged with the planetary gear 532, Gt; 534 < / RTI >

The carrier 531 includes a main body 535 having a rear end rotatably mounted on the front end surface of the rear drive shaft 420 and a main body 535 fixed to the rear end surface of the drive gear 510, (Not shown).

The rear end of the main body 535 is inserted into the front end surface of the rear drive shaft 420 and is coupled to the rear drive shaft 420. The center of rotation of the main body 535 is preferably positioned on the rotational center line of the rear drive shaft 420. The fixing member 536 is formed at the front end portion of the main body 535 so as to have an outer diameter larger than the outer diameter of the main body 535. [ The fixing member 536 is formed with a plurality of fixing projections 537 for fixing to the drive gear 510 at its edges. The fixing protrusions 537 protrude forward from the fixing member 536 and are bolted to the rear end surface of the drive gear 510, respectively. The carrier 531 rotates together with the drive gear 510 by the fixing protrusion 537. [

The planetary gear 532 is rotatably mounted on the fixing protrusion 537, and a plurality of gears are formed on the outer circumferential surface thereof. On the other hand, the planetary gear 532 may be fixed to the fixing protrusion 537 in accordance with the environment in which the vehicle is used.

The rear end of the ring gear 533 is fixed to the front end of the rear drive shaft 420 and a hollow is formed inside the planetary gear 532, the carrier 531 and the rear end of the front drive shaft 410. At this time, the rear end portion of the carrier 531 passes through the ring gear 533 and is fixed to the rear drive shaft 420.

A plurality of gears are formed along the circumferential direction so that the planetary gears 532 can be engaged with the inner peripheral surface of the ring gear 533. The main body 535 of the carrier 531 is rotatably supported by bearings, And is rotatably supported on the inner peripheral surface.

The sun gear 534 is fixed to the rear end of the front drive shaft 410 which is drawn into the ring gear 533 and a plurality of gear teeth are formed on the outer circumferential surface so as to be engaged with the planetary gear 532.

The operation of the differential unit 500 will be described in detail as follows.

First, when the same driving force is transmitted to the front drive shaft 410 and the rear drive shaft 420, the output clutch 520 is operated so that the drive gear 510 rotates together with the front drive shaft 410, And fixed to the drive shaft 410. The driving force of the idle shaft 300 is transmitted to the front drive shaft 410 through the first driven gear 612 and the drive gear 510 and the same driving force is transmitted to the rear drive shaft 410 through the drive gear 510 and the planetary gear unit 530, (420).

The drive clutch 510 is driven to rotate relative to the front drive shaft 410 through the output clutch so that the drive gear 510 rotates relative to the front drive shaft 410. [ (510) is released. At this time, the driving force of the idle shaft 300 is transmitted to the drive gear 510 through the first driven gear 612, and the carrier 531 rotates in accordance with the rotation of the drive gear 510. The planetary gear 532 rotates to rotate the ring gear 533 and the rear drive shaft 420 rotates as the ring gear 533 rotates. The sun gear 534 rotates as the planetary gear 532 rotates and the front drive shaft 410 rotates together with the sun gear 534. [ At this time, the front drive shaft 410 and the rear drive shaft 420 transmit different driving forces depending on the gear ratios of the gears constituting the planetary gear unit 530.

In this embodiment, the driving driving shaft 400 includes a front driving shaft 410 and a rear driving shaft 420 so as to transmit power to front and rear driving wheels for four-wheel drive, and distributes the power to each driving shaft as a differential However, the present invention is not limited to this, and the driving drive shaft 400 may be configured to transmit power only to either the front wheel or the rear wheel of the vehicle, and the differential unit 500 may be omitted.

The first power transmission unit 600 transmits the driving force input through the input shaft 200 to the idle shaft 300 and controls the rotation speed at which the idle shaft 300 rotates by selecting the high speed mode or the low speed mode It will be possible.

The first power transmission unit 600 includes a high-speed transmission unit 610 for transmitting the power of the input shaft 200 at a high speed to the idle shaft 300 when the high-speed mode is selected, To the idle shaft (300).

The high-speed transfer unit 610 and the low-speed transfer unit 620 can both be connected to or disconnected from the input shaft 200 by the selective connection unit 800 described later. The high-speed transfer unit 610 is connected to the input shaft 200 The connection of the low speed transmission portion 620 is released and when the low speed transmission portion 620 is connected to the input shaft 200, the connection of the high speed transmission portion 610 is released.

Of course, the selection connection unit 800 connects both the high-speed transmission unit 610 and the low-speed transmission unit 620 to the input shaft 200 so that the power of the input shaft 200 can be connected to the second power transmission unit 700 .

The high-speed transfer unit 610 is connected to the input shaft 200 by the selection connection unit 800 or to a first input (not shown) that is relatively rotatably mounted on the input shaft 200 to release the connection state from the input shaft 200. [ And a first driven gear 612 provided on the idle shaft 300 so as to be engaged with the first input gear 611.

The first input gear 611 has a through hole formed at a central portion thereof to allow the input shaft 200 to pass therethrough and a plurality of gear teeth formed at an outer circumferential surface thereof. The through hole is formed to have an inner diameter larger than the outer diameter of the input shaft 200 such that the first input gear 611 is relatively rotated with respect to the input shaft 200.

The first driven gear 612 is fixed to the idle shaft 300 facing the first input gear 611 so as to rotate together with the idle shaft 300 and rotatably supported by the first input gear 611 and the drive gear 510 A plurality of gears are formed on the outer circumferential surface so as to be engaged with each other. At this time, the first driven gear 612 is preferably formed to have a smaller number of gear teeth than that of the first input gear 611.

The low speed transmission portion 620 is connected to the input shaft 200 by the selective connection portion 800 or a second input portion that is relatively rotatably mounted on the input shaft 200 to release the connection state from the input shaft 200. [ And a second driven gear 622 provided on the idle shaft 300 so as to be engaged with the second input gear 621.

The second input gear 621 has a third through hole formed at a central portion thereof to allow the input shaft 200 to pass therethrough and a plurality of gear teeth formed at an outer circumferential surface thereof. The third through hole is formed to have an inner diameter larger than an outer diameter of the input shaft 200 such that the second input gear 621 is relatively rotated with respect to the input shaft 200. In this case, the second input gear 621 is preferably installed on the input shaft 200 at a position spaced rearward relative to the first input gear 611.

The second driven gear 622 is fixed to the idle shaft 300 opposed to the second input gear 621 so as to rotate together with the idle shaft 300 and is fixed on the outer peripheral surface so as to be engaged with the second input gear 621 And a plurality of gear teeth are formed. At this time, the second driven gear 622 is formed to have a larger number of gear teeth than the number of gear teeth of the second input gear 621.

The second input gear 621 and the second driven gear 622 are connected to the idle shaft 300 so that the idle shaft 300 can be rotated at a speed lower than that of the high- Is formed to be larger than the gear ratio of the first input gear 611 and the first driven gear 612.

The second power transmission unit 700 is connected to the input shaft 200 through an output shaft of an extremely low speed output shaft (not shown) so as to be connected to or disconnected from the input shaft 200, Speed output shaft 731 is connected to the input shaft 200 and is actuated by a driving force transmitted from the ultra low speed output shaft 731, A hydraulic motor 733 which is installed in the housing 100 and generates a rotational force by receiving the working fluid from the first hydraulic pump 732, And a sub power transmission portion 734 for transmitting the rotation force generated by the motor 733 to the idle shaft 300. [

The super low speed output shaft 731 extends in the front and rear direction, and the front end portion is drawn into the rear end portion of the input shaft 200 and is rotatably supported. At this time, it is preferable that the ultra-low speed output shaft 731 is installed so that the rotation center is located on the rotation center line of the input shaft 200. Speed output shaft 731 is connected to the input shaft 200 or disconnected from the input shaft 200 by the selective connection portion 800.

The first hydraulic pump 732 is fixed to the rear end of the housing 100 and is connected to the ultra low speed output shaft 731 to receive power from the ultra low speed output shaft 731. The first hydraulic pump 732 is operated by the power received from the ultra low speed output shaft 731 to pump the working fluid from a hydraulic tank (not shown) installed in the vehicle. The working fluid is preferably an incompressible fluid.

A plurality of hydraulic motors 733 are installed on the left and right sides of the housing 100 and are connected to the first hydraulic pump 732 through a fluid supply pipe (not shown). The hydraulic fluid supplied from the first hydraulic pump 732 causes the hydraulic motor 733 to generate a rotational force and the working fluid having passed through the hydraulic motor 733 flows through a fluid discharge pipe connected between the hydraulic tank and the hydraulic motor 733 (Not shown) to the hydraulic tank of the vehicle.

The sub power transmission portion 734 includes a sub shaft 735 installed in the housing 100 so as to be rotatable by the hydraulic motor 733 and a sub shaft 735 coupled to the sub shaft 735, And an idle gear 737 rotatably mounted on the housing 100 so as to engage with the driving gear 736 and the first driven gear 612 provided on the idle shaft 300, Respectively.

The sub shaft 735 is installed inside the housing 100 and has a rear end rotatably provided at the front end portion of the rotation shaft of the hydraulic motor 733 and is rotatably supported by a sub clutch (not shown) The connection to the rotary shaft or the connection to the rotary shaft is released. Although the sub-shaft 735 is not shown in the drawing, it is preferable that the front end portion is rotatably supported on the housing 100.

The sub clutch is engaged and disengaged from the sub shaft 735 and the rotation shaft of the hydraulic motor 733 by the sleeve moving in the forward and backward directions by the hydraulic cylinder.

The driving gear 736 is provided on the sub-shaft 735 so as to be able to rotate relative to the sub-shaft 735, and a plurality of gear teeth are formed on the outer circumferential surface. The idle gear 737 is rotatably supported on the housing 100 between the drive gear 736 and the first driven gear 612 and rotatably supported on the drive gear 736 and the first driven gear 612 And a plurality of gear teeth are formed on the outer circumferential surface.

The second power transmitting unit 700 is configured to transmit the driving force to the idle shaft 300 by using the reduction ratio of the speed lower than the low speed transmission portion 620 in order to rotate the idle shaft 300 at a super low speed lower than the low speed transmission portion 620 The idle gear 737, and the first driven gear 612 so that the gear ratio of the drive gear 736, the idle gear 737, and the first driven gear 612 is increased. The second power transmission unit 700 can also set the reduction ratio to a larger value in accordance with the capacity and set value of the first hydraulic pump 732 and the hydraulic motor 733 installed.

The selection connection unit 800 connects the input shaft 200 and the first input gear 611 in order to fix the first input gear 611 to the input shaft 200 or to release the fixed state of the first input gear 611 with respect to the input shaft 200. [ A first clutch 810 provided between the gears 611 and a second clutch 810 provided between the input shaft 200 and the second input gear 621 to fix the second input gear 621 to the input shaft 200 or to release the fixed state of the second input gear 621 with respect to the input shaft 200 A second clutch 820 installed between the input shaft 200 and the second input gear 621 and a second clutch 820 fixed between the input shaft 200 and the second input gear 621. The input shaft 200 is fixed to the output shaft 731, And a third clutch 830 provided between the input shaft 200 and the ultra-low speed output shaft 731 to release the fixed state of the engine. The first to third clutches 810, 820 and 830 connect or disconnect the input shaft 200 and the first or second input gears 611 and 621 through the sleeve moving in the forward and backward direction by the hydraulic cylinder, The low speed output shaft 731 is connected and disconnected, and is a conventionally used clutch so that detailed description is omitted.

The transfer case 10 according to the present invention further includes a speed sensor unit 1000 installed in the housing 100 for measuring the rotational speed of the idle shaft 300.

The speed sensor unit 1000 includes an impulse spacer 1010 fixed to an end of the idle shaft 300 and having a plurality of sensing projections 1011 spaced apart from each other along a circumferential direction on the outer circumferential surface thereof, And a speed sensing sensor 1020 mounted on the housing 100 to sense the sensing protrusion 1011 and to calculate a rotation speed of the idle shaft 300.

The impulse spacer 1010 is fixed to the front end of the idle shaft 300, and is formed in a disc shape having a predetermined outer diameter, and is formed of a metallic material. The detection protrusions 1011 protrude in the direction away from the center of rotation on the outer circumferential surface of the impulse spacer 1010 and are arranged so that eight are spaced apart from each other along the circumferential direction of the impulse spacer 1010.

The speed sensing sensor 1020 is fixed to the wall surface in the housing 100 in front of the impulse spacer 1010. The speed sensing sensor 1020 is spaced apart from the rotation axis of the impulse spacer 1010 and senses the sensing protrusion 1011 rotated by the rotation of the idle shaft 300 to rotate the idle shaft 300 Calculate the speed.

In the illustrated example, the speed sensor unit 1000 senses the speed of the idle shaft 300 by the impulse spacer 1010 and the speed sensing sensor 1020. However, But may be any sensing means capable of sensing the rotational speed of the idle shaft 300.

The rotation speed of the idle shaft 300 calculated by the speed sensor unit 1000 is displayed on the display panel installed in the driver's seat of the vehicle so that the driver can easily grasp the rotation speed. Since the rotational speed information of the idle shaft 300 is provided to the driver by the speed sensor unit 1000, the driver can easily grasp the operating state of the transfer case 10 at the driver's seat.

The second hydraulic pump 900 is installed at the rear of the first hydraulic pump 732 and pumps the working fluid by the very low speed output shaft 731 to transmit the power to the working device 910.

When the power of the input shaft 200 is connected to the second power transmission unit 700 by the selective connection unit 800, the working fluid pumped by the first hydraulic pump 732 is supplied to the hydraulic motor 733 and the sub- So that the idle shaft 300 is rotated at an extremely low speed through the power transmitting portion 734 so that the vehicle runs at an extremely low speed.

At this time, the ultra low speed output shaft 731 drives the second hydraulic pump 900 to transmit power to the work device 910. Accordingly, the working vehicle manufactured for a special purpose such as cleaning, snow removing, and weeding can operate the working device 910 through the driving force transmitted to the working device 910 during the ultra low-speed driving.

The transfer case 10 of the present invention may be provided with a separate power source for driving the working device 910 because the driving force supplied to the working device 910 can be supplied from the input shaft 200 for traveling the vehicle You do not have to.

The power transmission process for operating the transfer case 10 of the present invention constructed as described above will be described in more detail with reference to FIGS. 5 to 7. FIG.

5, the first clutch 810 is actuated to move the first input gear 611 to the input shaft 300 by operating the first clutch 810 so that the driving force of the engine can be transmitted to the idle shaft 300 at a high speed, The second input gear 621 and the very low speed output shaft 731 are disconnected from the input shaft 200 by using the second clutch 820 and the third clutch 830. The driving force inputted to the input shaft 200 is transmitted to the idle shaft 300 through the first input gear 611 and the first driven gear 612. The idle shaft 300 rotates at a relatively high speed, To the drive shaft (400).

6, the second clutch 820 is operated so as to transmit the driving force of the engine to the idle shaft 300 at a low speed in the low speed mode in which the vehicle is running at a low speed, And the first input gear 611 and the very low speed output shaft 731 are disconnected from the input shaft 200 by using the first clutch 810 and the third clutch 830. [ The driving force inputted to the input shaft 200 is transmitted to the idle shaft 300 through the second input gear 621 and the second driven gear 622 and the idle shaft 300 is lower than the high speed transmitting portion 610 So that the driving force is transmitted to the driving driving shaft 400.

7, in order to transfer the driving force of the engine to the idle shaft 300 at an extremely low speed in the operation mode in which the working device 910 is operated and the vehicle travels at extremely low speed, the third clutch Speed output shaft 731 is connected to the input shaft 200 via the first clutch 810 and the second clutch 820 and the first input gear 611 and the second input gear 611 are connected to the input shaft 200 using the first clutch 810 and the second clutch 820. [ 2 input gear 621 is disconnected. At this time, the sub clutch is also operated to interconnect the rotary shaft of the hydraulic motor 733 and the sub shaft 735.

The driving force inputted to the input shaft 200 is transmitted to the first hydraulic pump 732 through the ultra low speed output shaft 731 and the first hydraulic pump 732 is driven by the hydraulic motor 733 Pumped. The hydraulic motor 733 supplied with the operating fluid from the first hydraulic pump 732 generates a rotational force and the rotational force of the hydraulic motor 733 is transmitted to the idle shaft 300 through the subordinate power transmitting portion 734, Thereby rotating the shaft 300. At this time, the idle shaft 300 rotates so as to be lower in speed than the low-speed transmission portion 620 and transmits the driving force to the driving driving shaft 400.

In the ultra low speed running mode, the ultra low speed output shaft 731 also drives the second hydraulic pump 900 to pump the working fluid to the working device 910. The working device 910 is connected to the second hydraulic pump 900, Through a working fluid supplied from a working fluid supply source.

Accordingly, while the vehicle travels at an extremely low speed, the work device 910 operates to perform a work suited to the set purpose.

The transfer case 10 according to the present invention is capable of traveling at a very low speed by the second power transmission unit 700 composed of the first hydraulic pump 732 and the hydraulic motor 733. At this time, The second hydraulic pump 900 for driving the first and second hydraulic pumps 910 and 910 are driven together so that the traveling of the vehicle and the driving of the working device 910 can be performed simultaneously without any separate power source.

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features presented herein.

10: transfer case
100: housing 200: input shaft
300: Idle shaft 400: Driving drive shaft
410: front drive shaft 420: rear drive shaft
500: Differential unit 510: Drive gear
520: output clutch 530: planetary gear unit
531: Carrier 532: Planetary gear
533: ring gear 534: sun gear
600: first power transmission unit 610:
611: first input gear 612: first driven gear
620: Low speed transmission portion 621: Second input gear
622: second driven gear 700: second power transmission unit
731: super low speed output shaft 732: first hydraulic pump
733: Hydraulic motor 734: Sub power transmission part
735: sub-shaft 736: drive gear
737: idle gear 800: selection connection
810: first clutch 820: second clutch
830: Third clutch 900: Second hydraulic pump
910: Working device 1000: Speed sensor part

Claims (10)

A housing;
An input shaft rotatably installed in the housing and rotated by receiving a driving force from an engine;
An idle shaft installed in the housing to receive a driving force from the input shaft and rotate;
A driving drive shaft rotatably installed in the housing to receive power from the idle shaft and transmit power to the driving wheels of the vehicle;
A first power transmission unit transmitting the driving force of the input shaft to the idle shaft and selecting the high speed mode and the low speed mode to transmit the power;
A second power transmission unit connected to an ultra low speed output shaft connected to the input shaft and transmitting power to drive the idle shaft in an ultra low speed mode;
And an oil pump gear installed on the idle shaft for pumping the oil in the lower portion of the housing to the upper side of the housing through a rotational force of the idle shaft.
The method according to claim 1,
And a second hydraulic pump connected to the ultra low speed output shaft for transmitting the power to the working device while the second power transmission unit is operating, when the power of the input shaft is transmitted to the second power transmission unit Features a transfer case.
3. The method of claim 2,
The first power transmission unit is detachably connected to the input shaft and includes a high-speed transmission unit for transmitting the driving force of the input shaft to the idle shaft for the high-
And a low speed transmission portion that is detachably connected to the input shaft and transmits the driving force of the input shaft to the idle shaft for driving in the low speed mode,
And a selective connection portion for selectively connecting the power of the input shaft to the high-speed transmission portion, the low-speed transmission portion, or the second power transmission unit.
The method of claim 3,
The second power transmission unit
A first hydraulic pump connected to the ultra low speed output shaft for pumping the fluid in the hydraulic tank through a power transmitted by the ultra low speed output shaft, a hydraulic motor driven by the fluid pumped by the first hydraulic pump, And a sub power transmission portion for transmitting power generated in the motor to the idle shaft.
5. The method of claim 4,
The sub power transmission portion includes a sub shaft provided in the housing so as to be rotatable by the hydraulic motor,
A driving gear coupled to the sub-shaft and rotated together with the sub-shaft,
And an idle gear rotatably installed on the housing so as to engage with the first driven gear provided on the idle shaft.
5. The method of claim 4,
The high-
A first input gear which is connected to the input shaft by the selective connecting portion or is rotatable relative to the input shaft so as to be released from the input shaft,
And a first driven gear provided on the idle shaft so as to be engaged with the first input gear.
The method according to claim 6,
Wherein the low speed transmission portion includes a second input gear connected to the input shaft by the selective connection portion or installed to be rotatable relative to the input shaft so as to be released from the input shaft, And a second driven gear provided on the shaft,
Wherein the second input gear and the second driven gear are formed such that a gear ratio is larger than a gear ratio of the first input gear and the first driven gear.
8. The method of claim 7,
Wherein the driving driving shaft is connected to a front transmission shaft for transmitting a driving force to a front wheel of the vehicle and connected to a rear transmission shaft for transmitting a driving force to the rear wheel of the vehicle, And a rear drive shaft rotatably installed in the housing,
Further comprising a differential unit for distributing the driving force transmitted from the idle shaft to the front drive shaft and the rear drive shaft.
9. The method of claim 8,
The differential unit
A drive gear meshed with the first driven gear and installed to be rotatable relative to the front drive shaft,
An output clutch for connecting or disconnecting the drive gear to the front drive shaft so as to rotate together with the front drive shaft according to a driver's selection;
Wherein the driving force is transmitted from the drive gear to the rear drive shaft when the drive clutch is disengaged from the front drive shaft by the output clutch, And a planetary gear unit for transmitting driving forces of different sizes to the rear drive shaft.
10. The method of claim 9,
The planetary gear unit
A carrier fixed to the drive gear and rotating with the drive gear,
At least one planetary gear rotatably provided on the carrier at a position spaced apart from the center of rotation of the front drive shaft,
A ring gear which is provided at an end of the rear drive shaft and has a hollow for drawing the end of the planetary gear and the front drive shaft and has a plurality of gears meshed with the planetary gear on an inner circumferential surface thereof,
And a sun gear fixed to an end of the front drive shaft which is opposed to the planetary gear so as to be engaged with the planetary gear.

Images