KR102583451B1 - Pto hydraulic control valve device - Google Patents

Abstract

The PTO hydraulic control valve device of a work vehicle including a drive source, a drive wheel, a transmission for transmitting power from the drive source to the drive wheel, and a PTO device for using the power from the drive source for purposes other than driving is a PTO located at the rear of the transmission. It is mounted on the rear cover and PTO rear cover and may integrally include a hydraulic control valve connected to the PTO clutch of the PTO device.

Description

PTO hydraulic control valve device {PTO HYDRAULIC CONTROL VALVE DEVICE}

The present invention relates to a hydraulic control valve device for controlling a PTO clutch, and more specifically, to a PTO hydraulic control valve device that facilitates hydraulic control and minimizes pressure loss.

A work vehicle may refer to a vehicle that can perform additional work for the convenience of human life in addition to a vehicle for movement. A work vehicle can function as a transportation device that moves a worker to a specific location using a driving source such as an engine. It moves with the worker at a specific location or remains stationary and uses power from the driving source for purposes other than driving. It can be used for various purposes.

General work vehicles may include agricultural work vehicles such as combines or tractors, and in addition, there may be work vehicles that perform other tasks at construction sites or factories.

Looking at Japanese Patent No. 3940195, a work vehicle including a PTO is disclosed. The work vehicle includes an engine, a transmission, and a PTO device. Some of the power from the engine is transmitted to the driving wheels, etc. for driving, and the other part is transmitted to the PTO device, etc., and can be used for purposes other than driving.

The transmission includes a front housing, a mission housing, and a rear housing, and internally includes a driving power transmission unit that transmits power from the engine to the driving wheels, etc., and a PTO power transmission unit for tasks other than driving. The driving power transmission unit includes a forward/reverse unit, a main gear unit, and a sub-transmission unit. The direct/reverse unit is located in the front housing, the main gear unit and sub-transmission unit are located in the mission housing, and the front wheel drive case is located in the lower part of the mission housing and is connected to the transmission shaft. Power can be transmitted selectively. A pulley for a parking brake is installed in the transmission housing where the auxiliary transmission is located, so that it can function as an additional brake.

Conventional PTO devices also include a PTO clutch, and some control the PTO clutch hydraulically. However, since the conventional hydraulic PTO clutch and its control device are often installed far away from each other and involve pressure loss, the hydraulic control curve controlled by the hydraulic control device may be applied differently from the actual piston hydraulic pressure of the PTO clutch. .

The present invention provides a PTO hydraulic control valve device that can easily control the hydraulic pressure of the PTO clutch of the PTO device without pressure loss.

In providing a hydraulic control valve for a PTO device, the present invention provides a PTO hydraulic control valve device that is easy to install, maintain, and repair, and is easy to discharge air generated from the valve.

The present invention provides a PTO hydraulic control valve device that can prevent cases where the multi-stage independent PTO and the vehicle speed synchronized PTO are engaged at the same time and output is impossible, and can integrate the parts of the multi-stage independent PTO and the vehicle speed synchronized PTO into the cover using an interlock device. do.

The present invention provides a PTO hydraulic control valve device that can be managed from the outside by placing the hydraulic control valve and interlock device in a location that is easily accessible from the outside, and can be separated or released from the outside even if a failure occurs.

According to an exemplary embodiment of the present invention for achieving the above-described objects of the present invention, the PTO hydraulic control valve device according to the present embodiment includes a drive source, a drive wheel, a transmission that transmits power from the drive source to the drive wheel, and a drive source. Applicable to work vehicles including a PTO device for using power from the power source for purposes other than driving, the PTO hydraulic control valve device is mounted on the PTO rear cover and the PTO rear cover located at the rear of the transmission, and the PTO clutch of the PTO device It may integrally include a hydraulic control valve connected to.

The hydraulic control valve may be a proportional control valve or an on-off control valve, where the PTO clutch is placed within the differential housing of the transmission and the hydraulic control valve is provided integrally with the PTO rear cover, thereby reducing the distance between the PTO clutch and the hydraulic control valve. It is possible to minimize pressure loss between the hydraulic control valve and the hydraulic space inside the PTO clutch.

In addition, by allowing the hydraulic control valve to be mounted and replaced on the PTO rear cover in a cartridge manner, the number of parts and low-cost manufacturing can be possible.

The hydraulic control valve can be mounted horizontally along the length of the transmission in the PTO rear cover, and the hydraulic control valve can be assembled in the PTO rear cover from the rear toward the inside.

The PTO device may include a first shift rail shaft for controlling multi-stage independent shifting and a second shift rail shaft for controlling vehicle speed synchronization shifting, and the PTO hydraulic control valve device may include a first groove formed in the first shift rail shaft. , an interlock device including a second groove formed corresponding to the first groove in the second shift rail shaft, and an interlock ball located in the first groove and the second groove, by the interlock device, the first shift rail shaft And the second shift rail shaft can be coupled to the PTO rear cover and movably mounted as one piece.

Therefore, the shift control unit and output shaft of the PTO device can be integrated into the PTO rear cover to form a unit, and the entire PTO hydraulic control valve device, which unites the PTO cover and the PTO device, can be installed and removed from the differential housing at once. do.

When one of the first shift rail shaft and the second shift rail shaft is out of the neutral position, the interlock ball moves from one of the first groove and the second groove to the other to limit the movement of the other to synchronize the vehicle speed with the multi-stage independent PTO This can prevent cases where the PTO is engaged at the same time and output is impossible.

The interlock device allows the first power transmission unit for the multi-stage independent PTO and the second power transmission unit for the vehicle speed synchronized PTO to transmit power exclusively, and the first power transmission unit and the second power transmission unit can inadvertently engage with the drive source at the same time. This can prevent situations in which normal output is difficult to occur. This can also be restricted electronically, but in this embodiment, the interlock device can physically restrict the operation of the first shift control unit of the first power transmission unit and the second shift control unit of the second power transmission unit.

The PTO hydraulic control valve device of the present invention controls the hydraulic control of the PTO clutch with a proportional control valve, etc., and integrates the hydraulic control valve into the PTO rear cover disposed at the rear of the differential housing to reduce pressure loss in the hydraulic space of the PTO clutch. It can be minimized, and accurate control is possible according to the hydraulic cover in the original design.

The PTO hydraulic control valve device of the present invention mounts the hydraulic control valve on the PTO rear cover horizontally and longitudinally, and installs the hydraulic control valve higher than the oil level of the PTO clutch to discharge air from the valve generated when the engine is stopped. It can also be easy.

In the PTO hydraulic control valve device of the present invention, the hydraulic control valve is assembled from the rear of the PTO rear cover, so it is easy to install the high-pressure lubricant pipe from the tandem pump located on the outer right side of the differential housing directly to the PTO rear cover.

The PTO hydraulic control valve device of the present invention can prevent the case where output is impossible because the multi-stage independent PTO and the vehicle speed-coordinated PTO are engaged at the same time, and the parts of the multi-stage independent PTO and the vehicle speed-coordinated PTO can be integrated into the cover using an interlock device.

The PTO hydraulic control valve device of the present invention places the hydraulic control valve and interlock device in a location that is easily accessible from the outside, so it can be managed from the outside and can be separated or released from the outside even if a malfunction occurs.

1 is a diagram for explaining a work vehicle and a PTO hydraulic control valve device according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining the power transmission structure of the work vehicle of FIG. 1.
FIG. 3 is a plan view showing the inside of the differential housing and the PTO hydraulic control valve device of the work vehicle of FIG. 1.
FIG. 4 is a plan view of the PTO hydraulic control valve device of FIG. 1.
FIG. 5 is a side view of the PTO hydraulic control valve device of FIG. 1.
FIG. 6 is a view showing the PTO hydraulic control valve device of FIG. 1 from the rear.
FIG. 7 is a view showing the PTO device of the work vehicle of FIG. 1 from the rear.
FIG. 8 is a diagram for explaining the operation of the interlock device of the work vehicle of FIG. 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. For reference, in this description, the same numbers refer to substantially the same elements, and under the above rules, content written in other drawings may be cited and explained, and content deemed obvious to those skilled in the art or repeated may be omitted.

Figure 1 is a diagram for explaining a work vehicle and a PTO hydraulic control valve device according to an embodiment of the present invention, Figure 2 is a diagram for explaining the power transmission structure of the work vehicle in Figure 1, and Figure 3 is a diagram for explaining the power transmission structure of the work vehicle in Figure 1. It is a plan view showing the inside of the differential housing and the PTO hydraulic control valve device of the work vehicle, FIG. 4 is a plan view showing the PTO hydraulic control valve device of FIG. 1, and FIG. 5 is a plan view of the PTO hydraulic control valve device of FIG. 1. It is a view showing the device from the side, FIG. 6 is a view showing the PTO hydraulic control valve device of FIG. 1 from the rear, FIG. 7 is a view showing the PTO device of the work vehicle of FIG. 1 from the rear, and FIG. 8 is a view showing the PTO device of the work vehicle of FIG. 1 from the rear. This is a diagram for explaining the operation of the interlock device of the work vehicle in FIG. 1.

1 to 8, the work vehicle 100 according to this embodiment includes a drive source 110, a rear wheel or first drive wheel 120, a front wheel or second drive wheel 130, and a user driver 200. ), a transmission 300, a drive extraction device 400, a hydraulic shift valve device 500, a hydraulic PTO valve device 600, and a PTO device 700.

A drive source 110, such as an engine, generates power, and the power from the drive source 110 can be shifted or controlled through the transmission 300 and used for driving or tasks other than driving.

The transmission 300 may transfer all or part of the power transmitted from the drive source 110 to the first drive wheel 120 or the second drive wheel 130 for driving, and power for tasks other than driving may be transferred to the PTO. It can be transmitted to the device 700. The power transmitted to the PTO device 700 may be transmitted without shifting from the drive source 110, which is an engine, and rotates at 540 rpm, 1000 rpm, or proportional to the driving speed while the drive source 110 generates maximum or optimal torque. Can rotate in speed (GSP). Shifting within the PTO device 700 may be accomplished through the first shift control unit 735 using a shift clutch.

To this end, the PTO device 700 may include a first power transmission unit 730 for multi-stage independent shifting and a second power transmission unit 740 for synchronized vehicle speed shifting. The first power transmission unit 730 can receive power directly from the drive source 110 regardless of the rotation direction of the forward/reverse unit 310 and the shift by the main gear unit 320, and is connected through the PTO clutch 720. Power can be shifted to P1 and P2 and transmitted to the PTO output shaft (710). The second power transmission unit 740 is connected to the shaft of the subtransmission unit 350 and can transmit power in synchronization with the vehicle speed.

The user operating unit 200 may include a driver's seat 210, a steering wheel 220, a clutch pedal 230, a forward/backward operating unit 240, a main gear operating unit 250, and a sub-shift operating unit 260. The user can control the driving direction of the work vehicle 100 through the handle 220, etc., and control the rotation direction of the drive wheel through the forward and backward operation unit 240, and the main speed operation unit 250 and the The shift stage or shift range can be controlled through the shift control unit 260.

A clutch pedal 230 may be located on the left under the handle 220, a brake pedal may be provided on the right, and a parking brake 280 may be provided below the driver's seat 210. The brake pedal may be connected to a valve of a hydraulically operated brake device, and the first brake 140, which will be described later, can be operated according to the operation of the brake pedal.

In this embodiment, the user operating unit 200 may be provided in an exposed form, but may also include a cabin 270 depending on the case.

The forward/backward operation unit 240, the main speed operation unit 250, or the sub-shift operation unit 260 operates the forward/reverse operation unit 310, the high/low speed hydraulic clutch 330, the main speed clutch ( 340) The hydraulic pressure applied to the back can be proportionally controlled, and in this process, operating methods such as hydraulic, electric, or manual can be used.

Power passing through the transmission 300 may be transmitted to the rear wheel, that is, the first driving wheel 120, through the first differential 360. In some cases, some of the power may be extracted from the front wheel output shaft 410 through the drive extraction device 400 and transmitted to the front wheels, that is, the second drive wheel 130. When the second drive wheel 130 receives power like the first drive wheel 120 through the drive extraction device 400, the work vehicle 100 can drive in four-wheel mode, and the four-wheel mode is used for rough terrain or It can be usefully applied to moving the work vehicle 100 in a rice field or field. However, when driving on a general road, etc., it may be more efficient to drive in two-wheel mode rather than four-wheel mode. In this case, the drive extractor 400 does not transmit power to the front wheel output shaft 410, but operates the second drive. The wheel 130 can be switched to a two-wheel mode in which it rotates passively.

A first brake 140 may be installed between the first differential 360 and the first driving wheel 120, and the first brake 140 prevents the rotation of the first driving wheel 120, which mainly contributes to driving. By suppressing, the work vehicle 100 can be stopped. For reference, a pedal for operating the first brake 140 may be provided in the user driving unit 200 and may be provided on one or both sides of the driver's seat.

Power from the engine may be connected to the first driving wheel 120, the second driving wheel 130, or the PTO device 700 through the transmission 300, and a forward/reverse unit 310 is inside the transmission 300. , a main transmission unit 320, a sub transmission unit 350, a first differential 360, etc. may be provided.

Referring to Figure 2, the power from the drive source 110 can be applied for forward or backward movement through the forward/reverse unit 310, and the main gear unit 320 is a high-speed/low-speed hydraulic clutch 330, from 1st to 4th stages. It may include a hydraulic clutch 340 with adjustable main speed. The sub-transmission unit 350 can additionally adjust the shift section to the rotation shifted by the main gear unit 320, and as shown, can control the A, B, C or Cr (creep) sections using the shift clutch. You can.

In this embodiment, the high-speed/low-speed hydraulic clutch 330 and the main speed hydraulic clutch 340 are hydraulic clutches using friction plates and can be controlled by the hydraulic shift valve device 500, and the auxiliary transmission unit 350 Shift clutches can be electrically or hydraulically operated. The transmission 300 according to this embodiment can shift gears up to 24 or 32 steps by using the main transmission unit 320 and the sub transmission unit 350.

Some of the power from the engine may be transmitted to the PTO device 700 without passing through the forward/reverse unit 310 or the main accessory 320, and the power transmitted to the PTO device 700 may be transmitted to the hydraulic PTO valve device 600. ), a tandem pump, etc. can be driven, and the PTO output shaft 710 can also be driven. Within the PTO device 700, it may be transmitted to the PTO output shaft 710 through the PTO clutch 720 and the first power transmission unit 730.

Of course, some of the power from the engine can also be transmitted to the PTO device 700 through the forward/reverse unit 310 or the main accessory 320, and the power transmitted to the PTO device 700 is proportional to the driving speed. Alternatively, it can be transmitted at the corresponding rotation speed and can be used in work that is sensitive to vehicle speed, such as planting rice. Power synchronized with the vehicle speed may be transmitted to the PTO output shaft 710 through the second power transmission unit 740 within the PTO device 700.

A gear for extracting power to the outside may be mounted on the shaft on which the shift clutch is mounted in the subtransmission unit 350, and a drive extraction gear 370 is provided at the end thereof. The drive extraction gear 370 may be partially exposed from the housing of the transmission 300, and the drive extraction device 400 may be mounted in the area where the drive extraction gear 370 is exposed.

The drive extraction device 400 may transmit power transmitted from the transmission 300 to the second drive wheel 130 through the front wheel output shaft 410. The drive extraction device 400 may include an extraction housing 420, an extraction clutch 430, and a second brake 440, and the extraction clutch 430 is transmitted from the transmission 300 to the front wheel output shaft 410. Power can be controlled. At this time, the extraction clutch 430 may be provided using a dog clutch or the like.

2 and 3, the PTO device 700 includes a PTO output shaft 710, a first power transmission unit 730 that independently transmits power from the drive source 110 to the PTO output shaft 710, and a work vehicle. It may include a second power transmission unit 740 that transmits power to the PTO output shaft 710 in accordance with the traveling speed.

The first power transmission unit 730 may be connected to the PTO clutch 720 for a multi-stage independent PTO, and may include other clutches, gears, shifting devices, or a combination thereof, and the second power transmission unit 740 may include a clutch, gears, shifting device, or a combination thereof for vehicle speed synchronization PTO.

In this embodiment, the first power transmission unit 730 may include gears capable of transmitting 540 rpm and 1000 rpm and a first shift control unit 735 located between the gears, and the second power transmission unit 740 ) may include gears that transmit power from the sub-transmission unit 350 and a second shift control unit 745 connecting the PTO output shaft 710 and the second power transmission unit 740. The first shift control unit 735 and the second shift control unit 745 may use a shift clutch, and as will be described later, the shift clutches of the first shift control unit 735 and the second shift control unit 745 are each It can be controlled according to the movement of the shift rail shaft 737 and the second shift rail shaft 747.

The interior of the transmission 300 can be divided into a front housing, a mission housing, and a differential housing 306 from the front. In this embodiment, the PTO clutch 720, the first power transmission unit 730, the second power transmission unit 740, etc. may be located in the differential housing 306 where the differential 360 is located, and the differential housing 306 ) is covered by the PTO rear cover 308.

4 to 6, the PTO hydraulic control valve device 800 according to this embodiment includes a PTO rear cover 308 that covers the rear of the differential housing 306, and a hydraulic control valve of the hydraulic PTO valve device 600 ( 610), the rotation axis of the first power transmission unit 730, the first shift rail shaft 737 of the first shift control unit 735, the second shift rail shaft 747 of the second shift control unit 745, the first It may be provided by integrally combining the shift rail shaft 737, an interlock device 750 capable of restraining the second shift rail shaft 747, and a PTO output shaft 710.

The elements coupled to the PTO hydraulic control valve device 800 may be included in functionally different configurations, but are physically integrated and can be assembled and separated as a combined unit, and the operator can use a crane, etc. to assemble the unit. The PTO hydraulic control valve device 800 can be assembled and separated from the rear of the differential housing 306 at once.

In particular, the hydraulic control valve 610 is connected to the internal hydraulic space of the PTO clutch 720, the PTO clutch 720 is disposed in the differential housing 306, and the hydraulic control valve 610 is also connected to the PTO rear cover 308. It is installed to minimize the distance between the PTO clutch 720 and the hydraulic control valve 610. As a result, pressure loss between the hydraulic space of the hydraulic control valve 610 and the PTO clutch 720 can be minimized.

The hydraulic control valve 610 can be a proportional control valve or an on-off control valve, and the hydraulic control valve 610 can be mounted and replaced on the PTO rear cover 308 in a cartridge manner, reducing the number of parts and manufacturing at low cost. can make it possible.

The hydraulic control valve 610 may be mounted horizontally along the longitudinal direction of the transmission on the PTO rear cover 308, and the hydraulic control valve 610 may be assembled on the PTO rear cover 308 from the rear exterior to the front interior. can be designed.

As shown in FIG. 2, the interlock device 750 may be connected to the first power transmission unit 730 and the second power transmission unit 740 of the PTO device 700, and the first power transmission unit 730 By selecting one of the and the second power transmission unit 740, power can be transmitted exclusively to the PTO output shaft 710.

The interlock device 750 may be located at the end of the first shift control unit 735 of the first power transmission unit 730 and the second shift control unit 745 of the second power transmission unit 740, and specifically, the 1 The first shift rail shaft 737 of the first shift fork 738 that restrains the shift clutch of the shift control unit 735 and the second shift fork 748 that restrains the shift clutch of the second shift control unit 745 It may be located at the end of the second shift rail shaft 747.

7 and 8, the first shift rail shaft 737 and the second shift rail shaft 747 can move between a neutral position and an operating position. One end of the first shift rail shaft 737 is partially accommodated in the PTO rear cover 308, and can be moved from a neutral position to an operating position in close contact with the gears corresponding to P1 and P2. The second shift rail shaft 747 also has one end partially received in the PTO rear cover 308 and can move between a neutral position and an operating position connecting the PTO output shaft 710 and the second power transmission unit 740. .

The interlock device 750 includes a first groove 752 formed at the end of the first shift rail shaft 737, and a second groove 754 formed to face the first groove 752 in the second shift rail shaft 747. , and an interlock ball 756 positioned within the first groove 752 and the second groove 754 when the first shift rail shaft 737 and the second shift rail shaft 747 are in a neutral position. there is.

As shown in (a) of FIG. 8, when the first shift rail shaft 737 and the second shift rail shaft 747 are in a neutral position, the first groove 752 and the second groove 754 face each other. An interlock ball 756 may be located between them.

Then, as shown in (b), when the first shift rail shaft 737 moves out of the neutral position, the interlock ball 756 can move out of the first groove 752 and into the second groove 754, and the interlock ball 756 can move out of the first groove 752 and into the second groove 754. Due to (756), the second shift rail shaft 747 cannot leave the neutral position.

Conversely, as shown in (c), when the second shift rail shaft 747 is out of the neutral position, the interlock ball 756 can move out of the second groove 754 and into the first groove 752, and the interlock ball 756 can move out of the second groove 754 and into the first groove 752. Due to (756), the first shift rail shaft 737 cannot leave the neutral position.

As shown in FIG. 3, the second shift control unit 745 for vehicle speed synchronization PTO may be disposed in the differential housing 306, and both the first shift control unit 735 and the second shift control unit 745 are used for PTO. It may be provided adjacent to the output shaft 710. Accordingly, it may be possible to implement the interlock device 750 using the interlock ball 756.

In the interlock device 750, the interlock ball 756 may be located within the PTO rear cover 308, which may include an accessible hole 309 corresponding to the location of the interlock ball 756. You can. Therefore, even after assembling the PTO device 700, the interlock device 750 can be managed from the outside through the accessible hole 309, and even if an internal failure such as the separation of the interlock ball 756 occurs, the hole, etc. Since it can be released from the outside, problems can be easily dealt with.

As described above, although the present invention has been described with reference to preferred embodiments, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can do it.

100: work vehicle 110: drive source
140: first brake 200: user operating unit
300: Transmission 308: PTO rear cover
320: peripheral part 330: high-speed/low-speed hydraulic clutch
340: Main gear hydraulic clutch 350: Secondary gearbox
600: Hydraulic PTO valve device 610: Hydraulic control valve
700: PTO device 720: PTO clutch
730: first power transmission unit 735: first shift control unit
740: second power transmission unit 745: second shift control unit

Claims (6)

In the PTO hydraulic control valve device for a work vehicle, including a drive source, a drive wheel, a transmission for transmitting power from the drive source to the drive wheel, and a PTO device for using power from the drive source for purposes other than driving,
PTO rear cover located at the rear of the transmission; and
It includes a hydraulic control valve mounted on the PTO rear cover and connected to the PTO clutch of the PTO device,
The hydraulic control valve is mounted horizontally along the longitudinal direction of the transmission in the PTO rear cover,
The hydraulic control valve is horizontally assembled from the rear toward the inside of the PTO rear cover, and the hydraulic control valve is installed higher than the oil level in the transmission.
According to paragraph 1,
PTO hydraulic control valve device, characterized in that the hydraulic control valve is a proportional control valve or an on-off control valve.
delete delete According to paragraph 1,
The PTO rear cover covers the rear of the differential housing of the transmission, and the PTO clutch is disposed within the differential housing.
According to paragraph 1,
The PTO device includes a first shift rail shaft for controlling multi-stage independent shifting and a second shift rail shaft for controlling vehicle speed synchronized shifting,
The PTO hydraulic control valve device includes a first groove formed in the first shift rail shaft, a second groove formed in the second shift rail shaft corresponding to the first groove, and located in the first groove and the second groove. It further includes an interlock device including an interlock ball,
The first shift rail shaft and the second shift rail shaft are coupled to the PTO rear cover by the interlock device and can be moved as one,
When one of the first shift rail shaft and the second shift rail shaft is out of the neutral position, the interlock ball moves from one of the first groove and the second groove to the other to limit the movement of the other one. PTO hydraulic control valve device, characterized in that.