WO2013078819A1

WO2013078819A1 - Engineering truck and driving system thereof

Info

Publication number: WO2013078819A1
Application number: PCT/CN2012/074249
Authority: WO
Inventors: 李涛; 牛从民; 王涛
Original assignee: 湖南三一智能控制设备有限公司; 三一汽车起重机械有限公司
Priority date: 2011-11-28
Filing date: 2012-04-18
Publication date: 2013-06-06
Also published as: CN102514482A

Abstract

An engineering truck (100) and a driving system thereof. The driving system comprises a multistage axle, an upper truck engine (5), a hydraulic motor (10), a hydraulic pump (8) and a power take-off unit. The multistage axle and the upper truck engine (5) are arranged on the engineering truck; the hydraulic motor (16) is in driving connection with at least one stage axle (15); the hydraulic pump (8) is used for providing oil for the hydraulic motor (10); and the power take-off unit is connected to a power take-off port on the upper truck engine (5), and the power take-off unit is used for providing power for the hydraulic pump (8). Some axles are driven by utilizing the power of the upper truck engine (5) and a corresponding hydraulic system, or some axles are driven through an independent engine (1) and a hydraulic system corresponding thereto, so that an auxiliary driving force is provided for the whole truck under the circumstance that the driving capability of the lower truck engine is insufficient or the power transmission capability is poor, so as to improve the driving performance of the whole truck, thereby well satisfying the power requirement of the engineering truck (100) under the circumstance of bad road conditions or during climbing.

Description

The present invention claims the priority of the Chinese patent application filed on November 28, 2011, the Chinese Patent Application No. 201110382985.5, entitled "An Engineering Vehicle and Its Drive System", which The entire contents are incorporated herein by reference.

Technical field

The invention relates to the technical field of engineering machinery, in particular to an engineering vehicle and a driving system thereof.

Background technique

Engineering vehicles are widely used in heavy-duty transportation, construction, field hoisting, and public service. The construction environment is usually poor, and the road surface is uneven and the road conditions are poor. Therefore, the driving performance of the engineering vehicles has received increasing attention. For example, wheeled cranes often need to be moved back and forth between construction sites during construction operations. In the course of driving, it is often necessary to pull up mountains and wading. Therefore, customers are more concerned about wheeled cranes, especially large tonnage wheeled cranes. Drive performance requirements are getting higher and higher.

In the prior art, the getting off engine on the engineering vehicle provides power for the axle through the gearbox, the transmission shaft, etc., but for the engineering vehicle with more axles or larger p-positions, for example, for large tonnage wheeled cranes. Because of the large total wheelbase, it is difficult to meet the need to transmit power to a farther axle due to the common drive shaft mode or certain components on the power transmission chain, thus affecting the overall vehicle drive performance.

Therefore, how to improve the driving performance of the engineering vehicle is a technical problem to be solved by those skilled in the art.

Summary of the invention

In view of the above, the present invention is directed to an engineering vehicle and a drive system thereof, to solve the existing aspect, the present invention provides a drive system for a construction vehicle, the drive system including the engineering vehicle. Multi-level axles also include:

a loading engine provided on the engineering vehicle;

a hydraulic motor coupled to at least one stage axle drive;

a hydraulic pump that supplies oil to the hydraulic motor, the hydraulic pump taking a force from the upper engine. Further, the upper engine is provided with a power take-off port, and the hydraulic pump takes a force from the power take-off port through a power take-off. Further, the hydraulic system formed by the hydraulic pump and the hydraulic motor is a closed hydraulic system or an open hydraulic system.

further,

The hydraulic system is an open hydraulic system;

The open hydraulic system further includes a hydraulic oil tank and a directional control valve;

The oil inlet of the hydraulic pump is in communication with the hydraulic oil tank;

The oil outlet of the hydraulic pump and the hydraulic oil tank are connected to the inlet and outlet ports of the hydraulic motor through the directional control valve.

Further, the drive system further includes a clutch and/or a reducer disposed between the at least one stage axle (15) and the hydraulic motor.

further,

The drive system further includes a first drive shaft;

The at least one level axle is drivingly coupled to the at least another stage axle of the utility vehicle via the first drive shaft.

Further, the driving system further includes:

a lowering engine provided on the engineering vehicle;

a gearbox that is drivingly coupled to an output of the vehicle that is disengaged;

a transfer case connected to at least another stage of the engineering vehicle;

a second drive shaft for connecting the gearbox to the transfer case.

further,

The drive system further includes a third drive shaft;

An axle driven by the hydraulic motor and a axle driven by the transfer case are drivingly coupled via the third drive shaft.

In another aspect, the present invention also provides a driving system for another engineering vehicle, the driving system comprising a multi-stage axle disposed on the engineering vehicle and a getting-off engine for powering at least one level axle by a transmission manner, Also includes:

a hydraulic motor coupled to at least another stage of the engineering vehicle;

a hydraulic pump that supplies oil to the hydraulic motor;

An independent engine that powers the hydraulic pump, the independent engine being disposed on the engineering vehicle. In still another aspect, the present invention provides an engineering vehicle provided with the drive system of any of the above.

Further, the engineering vehicle is specifically a wheeled crane.

The driving system of the engineering vehicle provided by the invention and the engineering vehicle provided with the driving system fully utilize the power of the loading engine to add a hydraulically driven auxiliary power device for the engineering vehicle, so as to be on the engineering vehicle according to the needs Some axles (such as axles that are farther away from the engine) provide power; the driving system of another engineering vehicle provided by the present invention and the engineering vehicle provided with the driving system are additionally added with an independent engine, and The independent engine is equipped with a hydraulically driven auxiliary power unit to provide power to certain axles on the truck (such as axles that are farther away from the engine) as needed; compared to the prior art, the above schemes are It can effectively avoid the problem of insufficient power of the remote axle, improve the driving performance of the whole vehicle, and make the engineering vehicle have better passing ability when climbing the slope or under bad road conditions.

DRAWINGS

1 is a schematic structural view of an engineering vehicle having an upper engine and a lower engine; FIG. 2 is a schematic diagram of a composition of a driving system applied to the engineering vehicle shown in FIG. 1 according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a driving system applied to the engineering vehicle shown in FIG. 1 according to another embodiment of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the description and description of specific structures in this section are merely illustrative of specific embodiments and should not be construed as limiting the scope of the invention.

Please refer to FIG. 1 to FIG. 3 , wherein FIG. 1 is a schematic structural view of an engineering vehicle having an upper engine and a lower engine, and FIG. 2 is a schematic diagram of an engineering vehicle shown in FIG. 1 according to an embodiment of the present invention. FIG. 3 is a schematic diagram of the composition of a driving system applied to the engineering vehicle shown in FIG. 1 according to another embodiment of the present invention. The driving system of the embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3.

As shown in FIG. 1 , the engineering vehicle 1 QQ is provided with a getting off engine 1 and a getting off engine 5 , wherein the getting off engine 1 is generally used to power the driving of the engineering vehicle 100, and the getting on the engine 5 It is usually used to provide working power for the on-board equipment on the engineering vehicle 100. For example, when the engineering vehicle 100 is a truck crane, the getting-off engine 1 is used to provide driving power for the vehicle chassis, to meet the needs of the truck crane transition, and to get on the train. The engine 5 is used to power the lifting process of the truck crane.

As shown in FIG. 2, the driving system of this embodiment includes a multi-stage axle disposed on the chassis of the engineering vehicle 100, that is, the first axle 12, the second axle 13, the third axle 14, and the Nth vehicle. Bridge 15 and M-car axle 16, etc., also includes the lowering engine 1, the gearbox 2, the transmission shaft 3, the transfer case 4, the upper engine 5, the hydraulic oil tank 6, the power take-off 7, the hydraulic pump 8, the direction control Valve 9, hydraulic motor 10 and drive shaft 17 and so on.

The output end of the lower engine 1 is drivingly connected with the input end of the transmission 2, the output end of the transmission 2 is drivingly connected with one end of the transmission shaft 3, and the other end of the transmission shaft 3 is drivingly connected with the input end of the transfer case 4, The output of the movable box 4 is drivingly connected to a part of the axle through the transmission shaft to provide power thereto, and the transfer case 4 is shown in Fig. 1 through the transmission shaft with the first axle 12, the second axle 13 and the third The axle 14 is driven to connect.

The upper engine 5 has a power take-off port, and the power take-off 7 is drivingly connected with the power take-off port, the power take-off

The output end of 7 is connected to the hydraulic pump 8 to provide power thereto; the oil inlet of the hydraulic pump 8 is connected to the hydraulic oil tank 6 through a hydraulic hose, the oil outlet of the hydraulic pump 8 and the hydraulic oil tank 6 are respectively controlled by hydraulic hose and direction The valve 9 is connected to the inlet and outlet ports of the hydraulic motor 10; the output end of the hydraulic motor 10 is connected to a portion of the axle drive that is not driven by the transfer case 4, and only the output end of the hydraulic motor 10 and the Nth are shown in FIG. The axle 15 is drivingly coupled; the Nth axle 15 can be drivingly coupled to the Mth axle 16 via a drive shaft 17 to further power the Mth axle 16.

In the above embodiment, a clutch may be added between the hydraulic motor 10 and the Nth axle 15 as needed (not shown for selectively controlling engagement or disengagement of the hydraulic motor 10 and the Nth axle 15) and/or Or a speed reducer (not shown for increasing the reduction ratio), the clutch and the installation of the reducer can be found in the related prior art.

In the above embodiment, the directional control valve 9 is a two-position four-way solenoid valve, that is, the directional control valve 9 has two working states. In the first working state, the oil outlet of the hydraulic pump 8 is in communication with the hydraulic motor 10. The oil inlet (implemented by a hydraulic hose), the oil outlet of the hydraulic motor 10 is connected to the hydraulic oil tank 6 (through a hydraulic hose), and in the second working state, the oil outlet of the hydraulic pump 8 and the hydraulic motor 10 The oil outlets are all connected to the hydraulic oil tank 9, and the hydraulic pump 8 is not connected to the hydraulic motor. 10 oil supply; It should be noted that the above embodiment may also use other forms of directional control valves as long as the corresponding functions described above can be achieved.

In the above embodiment, the hydraulic system composed of the hydraulic pump 8, the hydraulic motor 10, the directional control valve 9, and the hydraulic oil tank 6 is an open hydraulic system. In other cases, a closed hydraulic system may be used as needed. The construction of a closed system can be found in the related prior art.

The working principle of the driving system of the above embodiment is as follows:

When the vehicle speed of the engineering vehicle 100 is higher than 10km/h (or other preset value), the hydraulic pressure is controlled by controlling the directional control valve 9 or controlling the clutch provided between the hydraulic motor 10 and the Nth axle 15 The Nth axle 15 and the Mth axle 16 do not have the driving capability, and the power provided by the lowering engine 1 through the conventional transmission mode is sufficient to meet the normal driving demand of the engineering vehicle 100;

When the vehicle speed of the engineering vehicle 100 is lower than 10 km/h (or other preset value) or the engineering vehicle 100 needs to climb, the directional control valve 9 or the control is provided between the hydraulic motor 10 and the Nth axle 15 The clutch causes the hydraulic pump 8 to supply oil to the hydraulic motor 10 and to engage the output end of the hydraulic motor 10 with the Nth axle 15. At this time, the Nth axle 15 and the Mth axle 16 have driving capability, in order to achieve better For the driving performance, the following steps can be implemented before the Nth axle 15 and the Mth axle 16 have driving force as needed (for example, by combining hardware and software): 1) Read the speed of the engine 1 to be disengaged, The torque and the gear position of the transmission 2, and calculate the average torque of the current axle; 2) adjust the displacement of the hydraulic pump 8, the displacement of the hydraulic motor 10, the output speed of the upper engine 5 or the power take-off 7 according to the average torque The parameters such as the rotational speed and torque of the Nth axle 15 and the Mth axle 16 after hydraulic driving are adapted to other axles.

It should be noted that in order to maintain the synchronization between the axle driven by the hydraulic motor 10 and the axle driven by the transfer case 4, it is also possible to add a corresponding transmission shaft between the two axles, for example, such as In another embodiment shown in FIG. 3, the embodiment has the lowering engine 1, the transmission 2, the transmission shaft 3, the transfer case 4, the upper engine 5, the power take-off 7, and the like, as described in the foregoing embodiments. The hydraulic pump 8, the directional control valve 9, the hydraulic motor 10, the first axle 12, the second axle 13, the third axle 14, the Nth axle 15, the Mth axle 16, and the transmission shaft 17, A first drive shaft 18 is disposed between the two axles, that is, the drive shaft 18 is drivingly coupled between the third axle 14 and the Nth axle 15.

It should be noted that, in the above embodiment, the hydraulic pump 8 receives power from the power take-off port of the upper engine 5 through the power take-off 7, but in other cases, for example, in order to fully utilize the lower engine 1 The power of the hydraulic pump 8 can also be obtained by the power take-off 7 from the power take-off port on the lower engine 1, the gearbox 2, the drive shaft 3 or the transfer case 4, so that the axles 15 and 16 can also be realized. Hydraulic drive.

It should be noted that, in the above embodiment, the hydraulic motor 10 is directly driven and connected to the Nth axle 15, but in other cases, for example, in order to make the wheels on both sides of the Nth axle 15 have different torques, Two hydraulic motors 10 are respectively connected to the two wheels of the Nth axle 15 to directly drive the two wheels. Further, in order to have a certain reduction ratio, it is also possible to add between the hydraulic motor 10 and the wheels as needed. The corresponding reducer.

It should be noted that, in the above embodiment, the power source of the hydraulic system is derived from the upper engine 5, but in other embodiments, an independent engine may be disposed on the engineering vehicle 100 as needed, and the independent engine is dedicated to The hydraulic system provides power. In this solution, the output of the independent engine drives the hydraulic pump to rotate. The hydraulic pump can supply the hydraulic motor without using the power take-off to obtain the power of the hydraulic motor, thereby driving the hydraulic motor to the corresponding axle.

It should be noted that in order to optimize the distribution of the power source and to facilitate the implementation, several axles of the multi-level axle near the engine 1 (ie, the first axle 12 and the second axle 13 shown in FIG. 1) And the third axle 14) is typically powered by the transfer case 4, while several axles away from the lower engine 1 (i.e., the Nth axle 15 and the Mth axle 16 shown in Figure 1) are typically The hydraulic motor 10 is used to power it.

A driving system for a construction vehicle according to an embodiment of the present invention drives certain axles by utilizing the power of the engine on the vehicle and the corresponding hydraulic system, or by using the independent engine and its corresponding hydraulic system for some axles. Driven to provide auxiliary driving force for the whole vehicle when the driving capacity of the conventional drive of the getting off engine is insufficient or its power transmission capability is poor, thereby improving the driving performance of the whole vehicle, and better satisfying the poor road condition or climbing of the engineering vehicle. The power needs, compared with the prior art, not only improves the power of the onboard engine, but also improves the passing ability of the engineering vehicle.

The embodiment of the present invention further provides a construction machine, such as a wheeled crane or a pump truck, having a multi-bridge chassis, and the engineering vehicle is provided with the drive system according to any one of the above, Technical effects, therefore, the engineering vehicle equipped with the drive system should also have corresponding technical effects, and the specific implementation process is similar to the above embodiment, and will not be described again.

The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A driving system for an engineering vehicle (100), comprising a multi-stage axle provided on the engineering vehicle (100), wherein the driving system further comprises:

a loading engine (5) provided on the engineering vehicle (100);

a hydraulic motor (10) coupled to at least one axle (15);

A hydraulic pump (8) for supplying oil to the hydraulic motor (10), the hydraulic pump taking a force from the upper engine (5).

2. The drive system according to claim 1, wherein: the upper vehicle engine (5) is provided with a power take-off port, and the hydraulic pump (8) is powered by the power take-off (7) Take the power.

The drive system according to claim 2, characterized in that the hydraulic system of the hydraulic pump (8) and the hydraulic motor (10) is a closed hydraulic system or an open hydraulic system.

4. The drive system of claim 3, wherein:

The hydraulic system is an open hydraulic system;

The open hydraulic system further includes a hydraulic oil tank (6) and a directional control valve;

The oil inlet of the hydraulic pump (8) is in communication with the hydraulic oil tank (6);

The oil outlet of the hydraulic pump (8) and the hydraulic oil tank (6) are connected to the inlet and outlet ports of the hydraulic motor (10) through the directional control valve (9).

The drive system according to any one of claims 1 to 4, wherein: the drive system further comprises a distance between the at least one axle (15) and the hydraulic motor (10) Clutch and / or reducer.

6. A drive system according to any one of claims 1 to 4, characterized in that:

The drive system further includes a first drive shaft (17);

The at least one stage axle (15) is drivingly coupled to at least another stage axle (16) of the utility vehicle via the first drive shaft (?).

The drive system according to any one of claims 1 to 4, wherein the drive system further comprises:

a lowering engine (1;) provided on the engineering vehicle (100);

a gearbox (2) that is drivingly coupled to the output of the vehicle (1);

a transfer case (4) drivingly coupled to at least another stage axle (12, 13, 14) of the engineering vehicle (100); A second drive shaft (3) for connecting the gearbox (2) to the transfer case (4).

8. The drive system of claim 7 wherein:

The drive system further includes a third drive shaft (18);

An axle driven by the hydraulic motor (10) and a axle driven by the transfer case (4) are drivingly coupled via the third transmission shaft (18).

A driving system for an engineering vehicle, comprising: a multi-stage axle disposed on the engineering vehicle; and a dismounting engine that provides power to at least one of the axles by means of a transmission, wherein the driving system further comprises:

a hydraulic motor coupled to at least another stage of the engineering vehicle;

a hydraulic pump that supplies oil to the hydraulic motor;

An independent engine that powers the hydraulic pump, the independent engine being disposed on the engineering vehicle.

An engineering vehicle, characterized in that: the engineering vehicle is provided with the drive system according to any one of claims 1 to 9.

11. The construction vehicle according to claim 10, wherein: the engineering vehicle is specifically a wheeled crane.