JP2001191807A - Vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle requiring litte assembling labor and suited to high discharge pressure in a traveling driving device. SOLUTION: This vehicle has a lower traveling body 2 provided with a traveling motor 9 for driving wheels and an upper turning body 4 arranged in the lower traveling body freely to be turned. A pump 12 for supplying the pressure medium to the traveling motor is arranged in the upper turning body, and the pump 12 is driven by a motor 11, and a control valve 31 for controlling moving direction and/or moving speed of the vehicle 1 is provided. A turning mechanism passing guide part 20 is arranged between the upper turning body and the lower traveling body, and the control valve 31 is arranged in a range of the lower traveling body 2. A discharge pipeline 26 connected to the pump 12 and a tank pipeline 30 connected to a tank 25 are guided through the turning mechanism passing guide part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a hydrostatic traveling drive, that is, a hydrostatic drive.
statusch. A) a self-propelled excavator comprising a traveling drive device and a plurality of driven wheels, the vehicle comprising at least one traveling motor provided for driving the wheels. A lower traveling body, and an upper revolving body that is rotatably disposed on the lower traveling body, and a pump that supplies a pressure medium to a traveling motor is disposed on the upper revolving body. Driven by the prime mover, a control valve is provided for controlling the direction and / or speed of movement of the vehicle, and a turning mechanism penetrating guide is disposed between the upper turning body and the lower running body. Regarding the format.

[0002]

2. Description of the Related Art Vehicles of this type are known as self-propelled excavators, cranes, harvesters or other work machines. A pump for supplying a pressure medium to a traveling motor of a hydrostatic traveling drive device is arranged on the upper rotating body together with a motor and a pressure medium tank for driving the pump. The traveling motor is disposed on the lower traveling body and drives, for example, a transmission. The transmission is connected to at least one of the vehicles by a joint shaft.
To one drive shaft, and thus to the vehicle wheel. A control valve for controlling the travel motor and thus controlling the direction and / or speed of movement of the vehicle (ie controlling both the direction and / or speed of movement of the vehicle) In known vehicles, it is arranged on the upper revolving superstructure. In known self-propelled excavators, which are provided with separate control valves for controlling the work equipment, for example the boom, arm and gripper, the control valve of the work equipment and the control valve of the travel motor are Are combined into one valve block, which is arranged on the upper structure. In such an arrangement, both pressure medium lines guided from the control valve for controlling the traveling motor to the traveling motor through the swivel mechanism penetrating guide are designed in accordance with the discharge pressure provided by the pump. Is required. This is because, depending on the direction of movement of the vehicle, that is, on the position of the control valve, a discharge pressure is generated in one of the pressure medium lines each time. Due to the use of increasing pump discharge pressures, high demands are placed on the sealing and pressure loss of the swivel through guide. The swivel mechanism through guide, which requires that both pressure medium lines guided to the traction motor be designed for the high discharge pressure of the pump, requires high construction effort to obtain high sealing performance and slight pressure loss. Need and
Consequently, high manufacturing costs are required, which also results in high manufacturing costs for vehicles.

[0003]

SUMMARY OF THE INVENTION The object of the invention is to improve a vehicle of the type mentioned at the outset, which requires only a small amount of construction and is suitable for high discharge pressures in traveling drives. It is to provide such a vehicle.

[0004]

In order to solve this problem, according to the present invention, the control valve is disposed in a range of a lower traveling body, and a discharge pipe connected to the pump and a tank are provided. Is guided through the swivel mechanism through guide.

[0005]

By disposing a control valve for controlling the traveling motor in the range of the lower traveling body, that is, between the turning mechanism penetrating guide and the traveling motor, the pump passes through the pivoting mechanism penetrating guide. It is only necessary to design only the pressure medium line guided to the control valve in accordance with the discharge pressure. In such an arrangement of the control valve, another pressure medium line guided from the control valve through the swivel through guide to the tank is designed for small pressures and formed as a tank line. be able to. Therefore, simply 1
Only one discharge line and one tank line need be guided through the swivel through guide. As a result, the time and effort required for the turning mechanism penetrating guide is reduced.
Furthermore, the swivel through guide, in which only one discharge line is guided, can be simply designed in such a way that it is adapted to high pressures and that a low pressure loss is obtained. Therefore, the vehicle, in particular the self-propelled excavator, can be easily operated with high production pressure at the traveling drive with low production costs.

In the configuration of the present invention, the control valve is disposed on the traveling motor. The control valve may in this case be mounted on the traction motor or integrated into the control bottom housing of the traction motor. As a result, it is possible to reduce the construction time.

In a further advantageous embodiment of the invention, the control valve is arranged on the swivel through guide. This further reduces the time and effort required for operating and controlling the control valve.

When the control valve is formed as a direction switching / brake valve, high driving safety of the vehicle is obtained. Because of such combined direction switching
This is because the brake valve has not only a function as a control valve for controlling the moving direction and the moving speed of the vehicle but also a function as a brake valve for preventing an increase in the speed of the vehicle when traveling downhill. Furthermore, this reduces the construction effort. This is because a separate brake valve disposed on the traveling motor can be dispensed with.

The control valve may be hydraulically (hydraulic) or electrically operable. For operating the control valve, it is advantageous if at least one hydraulic control pressure line or at least one electrical signal line is guided through the swivel through guide.

In a further advantageous embodiment of the invention, the undercarriage is provided with at least one further control valve for controlling another consumer, the control valve being provided with a swivel mechanism feed-through. It is connected to a discharge pipe guided through the section and a tank pipe guided through the swivel mechanism through guide. For example, in the case of a vehicle designed as a self-propelled excavator, the undercarriage has another hydraulic consumer,
For example, a hydraulic steering device, a shield support device (Schildabstuetzung) or a pawl leg support device (Pratzenabstuetzung) is arranged. In this case, a control valve for controlling the steering cylinder of the steering device or a control valve for controlling the support cylinder of the shield support device or the claw leg support device is provided with a discharge pipe and a tank pipe guided through the turning mechanism through guide. In this case, only the discharge conduit for guiding the discharge pressure of the pump need be guided through the swivel mechanism through guide.

In a configuration in which the pump is formed as a pump whose required flow rate is controlled, a load pressure notification pipe for detecting a load pressure of a consumer disposed on the lower traveling body passes through the swivel mechanism through guide. It is particularly advantageous to be guided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a vehicle 1 embodied as a self-propelled excavator (Mobilbagger) according to the known prior art. The vehicle 1 includes a lower traveling body 2 and an upper revolving body 4 that is rotatably disposed on the lower traveling body 2 by a center joint or a swivel joint 3.
And Drive shafts 5 and 6 are provided on the lower traveling body 2, and wheels for driving the vehicle 1 are arranged on these drive shafts 5 and 6. In order to drive the wheels, a transmission 7 is provided on the undercarriage 2, which is connected to drive shafts 5, 6 via a propeller shaft 8. To drive the transmission 7, a hydraulic, ie hydraulic, travel motor 9 is provided, which is fastened to the transmission 7 by a flange. One drive shaft 6 can in this case be designed as a steering shaft.

A motor 11, for example, an internal combustion engine formed as a diesel engine, is disposed on the upper rotating body 4. The motor 11 is a hydraulic pump 12.
Drive. A pressure medium tank 10 is also arranged on the upper rotating body 4, and the pressure medium tank 10 is provided with a pump 12.
It is connected to the entrance side. A discharge line extending from the pump 12 leads to a control valve block 13 having a plurality of control valves. In this case, the control valve block 13 includes a control valve for controlling the traveling motor 9 and a turning mechanism motor 19.
Control valve for controlling the position of the vehicle, and a claw leg supporting portion (platzenabstuetzung) disposed on the lower traveling body 2
A control valve for controlling a support device 14 formed as a steering wheel, a control valve for controlling a steering cylinder arranged on a drive shaft 6 formed as a steering shaft, and a plurality of controls for controlling work equipment And a valve. The control valve of the work equipment includes, for example, a control valve for controlling the boom cylinder 15, a control valve for controlling the arm cylinder 16, and a control valve for controlling the bucket cylinder 17 or the gripper cylinder 18. ing. A plurality of pressure medium lines guided from the control valve of the travel motor 9, the control valve of the steering cylinder and the control valve of the support device 14 to the corresponding consumer respectively pass through the swivel mechanism through guide 20 in this case. Has been guided. The turning mechanism penetrating guide 20 is arranged on the turning axis of the turning joint 3 between the upper turning body 4 and the lower traveling body 2.

In such a construction of a self-propelled excavator having a plurality of control valves arranged on the upper revolving unit 4, a swing mechanism is provided by a control valve for the traveling motor 9 arranged on a control valve block 13. A plurality of pressure medium lines guided to the travel motor 9 through the through guide 20 must be designed for the discharge pressure of the pump 12. This is because, depending on the switching position of the control valve, that is, in the direction of travel of the vehicle, a discharge pressure can be created in both pressure medium lines alternately.

A further consumer, for example a steering cylinder and a support cylinder for operating the support device 14, is arranged on the undercarriage so that the control valve block 13
From the corresponding control valve arranged at the turning mechanism
The pressure medium lines guided to each consumer through 0 also
Again, it must be designed for the discharge pressure of the pump 12. Therefore, the plurality of pressure medium lines guided through the swivel mechanism through guide 20 must be designed for the discharge pressure provided by the pump 12, whereby the swivel mechanism through guide 20 and thus the vehicle A structure is created in which 1 has a high construction effort.

FIG. 2 shows a hydraulic circuit diagram of a vehicle according to the invention, for example formed as a self-propelled excavator. Pump 12 driven by prime mover 11
Sucks the pressure medium from the tank 25 and
Discharge to 6. The discharge pipe 26 includes a plurality of control valves 2.
7, 28 and 29 are connected. In this case, the control valve 27 is connected to, for example, the boom cylinder 15, the control valve 28 is connected to the arm cylinder 16, and the control valve 29 is connected to the bucket cylinder 17 or the gripper cylinder 18. These control valves 27, 28,
29 is connected to one tank line 30, and this tank line 30 is guided to the tank 25. Another control valve may be connected to the discharge line 26. Motor 11, pump 12, tank 25, and control valve 2
7, 28 and 29 are arranged on the upper swing body 4.

In the configuration of the present invention, the control valve 31 for controlling the traveling motor 9 is arranged on the lower traveling body 2 of the vehicle formed as a self-propelled excavator. In this case, the discharge line 26 and the tank line 30 are guided through the swivel through guide 20 and are connected to a control valve 31. A further control valve 32 arranged on the undercarriage 2, for example a control valve 32 for controlling a steering cylinder or a support cylinder for operating a support device, is likewise provided with a swivel mechanism through guide 20.
And a tank line 30 guided through the swivel mechanism through guide 20. The control valves 31, 32 can in this case be flanged directly to the swivel guide 20 in the region of the undercarriage 2. Further, the control valves 31, 32 are arranged in the consumer,
Thus, for example, the control valve 31 can also be incorporated in the control bottom housing of the travel motor 9.

The control valves 31, 32 may be electrically or hydraulically operable. For this purpose, corresponding electrical signal lines or hydraulic control pressure lines must be guided through the swivel through guide 20.

FIG. 3 shows an improved version of the vehicle according to the invention. Control valve 3 for controlling traveling motor 9
1 is formed as a combined directional control / brake valve and has two control spools 35,36. In this case, depending on the selected traveling direction, one control spool 35; 36 functions as a control valve that regulates the traveling speed and traveling direction of the vehicle, and the other control spool 36; Acts as a brake valve to prevent the vehicle speed from increasing at times. Double control spool 3
The control valve 31 with 5, 36 is in this case connected to the discharge line 26, which is guided through the swivel guide 20 and the tank line 30. The discharge pipe 26 and the tank pipe 30 may be connected to different control valves for controlling different consumers in the range of the upper revolving unit 4 and the range of the lower traveling unit 2, respectively. Control spool 3 of control valve 31
5, 36 are hydraulically operable. For this purpose, two control pressure lines 38, 39 are guided through the swivel mechanism through guide 20 and the control spool 3
5 and 36 are connected to corresponding control pressure chambers. Correspondingly, the control valve 31 may be electrically controllable. In that case, the electrical signal line must be guided through the swivel mechanism guide 20. The pump 12 is a pump (beda) whose required flow rate is controlled.
rfstromgeregelt. (Pumpe). Control spools 35, 3 of control valve 31
In 6, the load pressure of the traveling drive device is detected and is notified to the load pressure notification pipe 40. The load pressure notification pipe 40 is guided through the turning mechanism penetrating guide 20. A load pressure notification pipe of another consumer may be connected to the load pressure notification pipe 40 in the range of the lower traveling body 2 and the range of the upper swing body 4. Shuttle valve chain (Wechse not shown)
Through the ventilkette, it is ensured that the maximum load pressure loads the pump controller 41 of the pump 12, for example the required flow controller, when a plurality of consumers are controlled.

As can be seen from FIGS. 2 and 3, in the vehicle according to the present invention, the discharge line 26 in which the discharge pressure of the pump 12 is generated, and the tank line 30 connected to the tank 25.
Only two pipes need to be guided through the swivel through guide 20. Thus, the configuration labor required for the turning mechanism penetrating guide portion 20 is reduced. This is because it is only necessary to design one pressure medium line guided through the swivel mechanism through guide section 20 in accordance with the discharge pressure of the pump 12. Further, since the control valves 31 and 32 are disposed on the lower traveling body 2 of the vehicle 1, the discharge pipe 26 guided through the turning mechanism penetrating guide 20 is provided.
Can be designed so that a small pressure loss and a high discharge pressure can be obtained with only a little effort.

[Brief description of the drawings]

FIG. 1 is an overall view of a vehicle formed as a self-propelled excavator according to the prior art.

FIG. 2 is a hydraulic circuit diagram of a vehicle according to the present invention.

FIG. 3 is a hydraulic circuit diagram of a vehicle according to an improvement of the present invention.

[Explanation of symbols]

1 vehicle, 2 undercarriage, 3 swivel joint,
4 upper revolving superstructure, 5, 6 drive shaft, 7 transmission,
8 propeller shaft, 9 traveling motor, 10
Pressure medium tank, 11 prime mover, 12 pump,
13 control valve block, 14 support device, 15 boom cylinder, 16 arm cylinder, 17 bucket cylinder, 18 gripper cylinder, 19 turning mechanism motor, 20 turning mechanism penetration guide, 25
Tank, 26 discharge line, 27, 28, 29 control valve, 30 tank line, 31, 32 control valve, 3
5,36 control spool, 38,39 control pressure line,
40 Load pressure notification pipeline, 41 Pump controller

Claims (8)

[Claims] 1. A vehicle comprising a hydrostatic traveling drive device and a plurality of driven wheels, the vehicle comprising at least one traveling motor provided for driving the wheels. And a pump for supplying a pressure medium to a traveling motor is disposed on the upper revolving unit, and the pump is disposed on the upper revolving unit. Is driven by a prime mover, a control valve is provided for controlling a moving direction and / or a moving speed of the vehicle, and a turning mechanism penetrating guide portion is disposed between the upper turning body and the lower running body. In one type, the control valve (31) is arranged in the area of the undercarriage (2), and is connected to a discharge pipe (26) connected to the pump (12) and a tank (25). Connected tank line (30) Are guided through a turning mechanism penetration guide section (20). 2. The traveling motor (9), wherein the control valve (31) is a traveling motor (9).
The vehicle according to claim 1, wherein the vehicle is disposed on a vehicle. 3. Vehicle according to claim 1, wherein the control valve (31) is arranged in a turning mechanism penetration guide (20). 4. The vehicle according to claim 1, wherein the control valve is formed as a direction switching / brake valve. 5. The control valve (31) is hydraulically operable, and at least one hydraulic control pressure line (38; 39) is guided through the swivel through guide (20). The vehicle according to any one of claims 1 to 4, wherein the vehicle is operated. 6. The control valve according to claim 1, wherein the control valve is electrically operable, and at least one electrical signal line is guided through the swivel through guide. The vehicle according to any one of the preceding claims. 7. The undercarriage (2) is provided with at least one further control valve (32) for controlling another consumer, said control valve (32) being a pivoting mechanism through guide. 7. A discharge line (26) guided through a section (20) and a tank line (30) guided through a swivel through guide (20). 8. The vehicle according to any one of the preceding claims. 8. A load pressure notification pipe (40) configured to detect a load pressure of a consumer disposed on the lower traveling body (2), wherein the pump (12) is formed as a pump whose required flow rate is controlled. 8. The vehicle according to claim 1, wherein the vehicle is guided through a swivel through guide (20).