Transfer case, range extender assembly and engineering machinery

Abstract

The utility model provides a transfer case, range extender assembly and engineering machinery, transfer case is applicable to the engineering machinery, the engineering machinery comprises an engine, a generator and a hydraulic pump, transfer case includes: transfer case, transfer case includes casing and is located the planetary gear subassembly in the casing, planetary gear subassembly includes planet carrier, sun gear and a plurality of planet gear, the multiple planet gears are arranged around the outer circumferential face of the sun gear at intervals, and all the planet gears are installed on the planet carrier and engaged with the sun gear. Wherein the planet carrier is connected with an output shaft of the engine, and the sun gear is in transmission connection with an input shaft of the generator, so that the problem that in the prior art, an engine of a range extender structure for engineering machinery cannot work in the optimal efficiency interval all the time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hybrid power, and in particular to a transfer case, a range extender assembly and engineering machinery. Background Art

[0002] Currently, there are many hybrid power system architectures, including series, parallel, series-parallel, and power split. Common hybrid power systems with range extenders for construction machinery in the existing technology include the following two:

[0003] (1) The engine and the generator are connected through a coupling. The generator is responsible for generating electricity to supply the drive motor, the first motor, and the second motor, a total of three motors and their controllers, to achieve the three major functions of walking, steering, and lifting. However, the above-mentioned range extender structure for engineering machinery uses more motors and controllers, and the corresponding thermal management system structure will be more complex, with higher production costs and lower reliability.

[0004] (2) The generator generates electricity to supply the drive motor for movement. The rear end of the generator is equipped with a transfer case, which rotates the steering pump and the lifting pump continuously. When the lifting pump and the steering pump are not working, the pressure relief valve opens to allow the hydraulic oil to return, and the corresponding actuator does not work. When lifting or steering is required, the pressure relief valve closes, and the hydraulic oil flows through the actuator, and the corresponding action is generated. The advantage of this structure is that it eliminates the need for controllers for the two motors, and the corresponding thermal management system can also be cancelled, greatly reducing complexity and production costs. However, the valve of the pressure relief valve is always in the standby open state, and the hydraulic pump is always working and the hydraulic oil is constantly flowing. When it is not working, the energy consumption is large, and the engine speed also needs to be continuously adjusted under different lifting powers. This makes it impossible for the engine to always work in the optimal efficiency range, resulting in the range extender being more fuel-consuming. Utility Model Content

[0005] The main purpose of the present utility model is to provide a transfer case, a range extender assembly and an engineering machine, so as to solve the problem that the engine of the range extender structure for engineering machinery in the prior art cannot always operate in the optimal efficiency range.

[0006] In order to achieve the above-mentioned purpose, according to the first aspect of the present utility model, a transfer case is provided, which is suitable for a range extender assembly of engineering machinery, the range extender assembly includes an engine and a generator, the engineering machinery includes a hydraulic pump, and the transfer case includes: a transfer case, the transfer case includes a housing and a planetary gear assembly located in the housing, the planetary gear assembly includes a planetary carrier, a sun gear and a plurality of planetary gears, the plurality of planetary gears are arranged at intervals around the outer circumference of the sun gear, and each planetary gear is mounted on the planetary carrier and meshes with the sun gear; wherein, the planetary carrier is connected to the output shaft of the engine, the sun gear is connected to the input shaft of the generator by transmission, and the planetary gears are connected to the input shaft of the hydraulic pump by transmission.

[0007] Furthermore, the transfer case includes a double-sided gear ring and a driven wheel located in the housing. The double-sided gear ring is rotatably mounted on the housing. The double-sided gear ring is sleeved outside a plurality of planetary gears and meshes with each of the planetary gears. The driven wheel is located outside the double-sided gear ring and meshes with the double-sided gear ring. The driven wheel is connected to the input shaft of the hydraulic pump.

[0008] Furthermore, the transfer case includes a bearing, and the double-sided gear ring is rotatably connected to the housing through the bearing.

[0009] According to a second aspect of the present invention, a range extender assembly is provided, comprising an engine and a transfer case, wherein the transfer case is the above-mentioned transfer case, and an output shaft of the engine is drivingly connected to a planetary carrier of the transfer case.

[0010] Furthermore, the range extender assembly includes a coupling, and both ends of the coupling are respectively connected to the output shaft and the planet carrier of the engine.

[0011] Furthermore, the coupling is an elastic coupling.

[0012] Furthermore, the engineering machinery includes a generator, a drive motor and a battery, any two of the generator, the drive motor and the battery are electrically connected, and the sun gear of the transfer case is drivingly connected to the input shaft of the generator.

[0013] According to a third aspect of the present utility model, there is provided an engineering machine comprising the above-mentioned range extender assembly. The engineering machine further comprises a hydraulic pump, a steering mechanism and a lifting mechanism. The outlet of the hydraulic pump is connected to the inlet of the steering mechanism and the inlet of the lifting mechanism, and the planetary gear of the transfer case is transmission-connected to the input shaft of the hydraulic pump.

[0014] Furthermore, the engineering machinery includes a steering control valve, the outlet of the hydraulic pump is connected to the inlet of the steering mechanism via the steering control valve, and the outlet of the steering mechanism is connected to the inlet of the hydraulic pump.

[0015] Furthermore, the engineering machinery includes a lifting control valve, the outlet of the hydraulic pump and the inlet of the lifting mechanism are connected via the lifting control valve, and the outlet of the lifting mechanism is connected to the inlet of the hydraulic pump.

[0016] Applying the technical solution of the present invention, the transfer case of the present invention is suitable for a range extender assembly of engineering machinery, the range extender assembly includes an engine and a generator, the engineering machinery includes a hydraulic pump, and the transfer case includes: a transfer case, the transfer case includes a housing and a planetary gear assembly located in the housing, the planetary gear assembly includes a planet carrier, a sun gear and a plurality of planetary gears, the plurality of planetary gears are arranged at intervals around the outer circumference of the sun gear, and each planetary gear is mounted on the planet carrier and meshes with the sun gear; wherein, the planet carrier is connected to the output shaft of the engine, the sun gear is transmission-connected to the input shaft of the generator, and the planetary gears are transmission-connected to the input shaft of the hydraulic pump. In this way, the transfer case of the utility model is placed between the engine and the generator of the engineering machinery. By setting up a planetary gear assembly, the setting similar to the two hydraulic motors used in the prior art is eliminated, and the low-speed input of the engine and the high-speed output of the sun gear are realized, so that the purpose of using a high-speed generator with small torque and volume can be achieved, so that the speed adjustment of the generator is faster and more responsive. By adjusting the speed of the generator, the speed of the hydraulic pump can be changed while the speed of the engine remains unchanged, thereby adjusting the flow and pressure of the hydraulic pump, etc., so that the speed of the engine can operate in the economically friendly zone under different lifting powers, solving the problem that the engine of the range extender structure for engineering machinery in the prior art cannot always operate in the optimal efficiency range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A connection diagram of an embodiment of an engineering machine according to the present utility model is shown.

[0019] The above drawings include the following reference numerals:

[0020] 1. Engine; 2. Generator; 3. Drive motor; 4. Battery; 5. Hydraulic pump; 6. Steering mechanism; 7. Lifting mechanism;

[0021] 8. Transfer case; 81. Housing; 82. Planetary gear assembly; 83. Planet carrier; 84. Sun gear; 85. Planetary gears; 86. Double-sided ring gear; 87. Driven gear; 88. Bearing;

[0022] 9. Coupling; 10. Steering control valve; 11. Lifting control valve. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] like Figure 1 As shown, the utility model provides a transfer case, which is suitable for a range extender assembly of engineering machinery. The range extender assembly includes an engine 1 and a generator 2, and the engineering machinery includes a hydraulic pump 5. The transfer case includes: a transfer case 8, the transfer case 8 includes a housing 81 and a planetary gear assembly 82 located in the housing 81, the planetary gear assembly 82 includes a planet carrier 83, a sun gear 84 and a plurality of planetary gears 85, and the plurality of planetary gears 85 are arranged at intervals around the outer circumference of the sun gear 84, and each planetary gear 85 is mounted on the planet carrier 83 and meshes with the sun gear 84; wherein the planet carrier 83 is connected to the output shaft of the engine 1, the sun gear 84 is transmission-connected to the input shaft of the generator 2, and the planetary gears 85 are transmission-connected to the input shaft of the hydraulic pump 5.

[0025] In this way, the transfer case of the present invention is placed between the engine 1 and the generator 2 of the engineering machinery. By setting the planetary gear assembly 82, the setting similar to the two hydraulic motors used in the prior art is eliminated, and the low-speed input of the engine 1 and the high-speed output of the sun gear 84 are achieved, so that the purpose of using a high-speed generator with small torque and volume can be achieved, so that the speed adjustment of the generator 2 is faster and more responsive. By adjusting the speed of the generator 2, the speed of the hydraulic pump 5 can be changed when the speed of the engine 1 remains unchanged, thereby adjusting the flow and pressure of the hydraulic pump 5, etc., so that the speed of the engine 1 can operate in the economically friendly zone under different lifting powers, solving the problem that the engine of the range extender structure for engineering machinery in the prior art cannot always operate in the optimal efficiency range.

[0026] like Figure 1 As shown, the transfer case 8 includes a double-sided gear ring 86 and a driven wheel 87 located in the housing 81. The double-sided gear ring 86 is rotatably mounted on the housing 81. The double-sided gear ring 86 is sleeved outside a plurality of planetary gears 85 and meshes with each of the planetary gears 85. The driven wheel 87 is located outside the double-sided gear ring 86 and meshes with the double-sided gear ring 86. The driven wheel 87 is connected to the input shaft of the hydraulic pump 5.

[0027] like Figure 1 As shown, the transfer case 8 includes a bearing 88 , and the double-sided gear ring 86 is rotatably connected to the housing 81 via the bearing 88 .

[0028] like Figure 1 As shown, the present invention further provides a range extender assembly, including an engine 1 and a transfer case 8 , wherein the transfer case 8 is the above-mentioned transfer case, and the output shaft of the engine 1 is drivingly connected to the planetary carrier 83 of the transfer case 8 .

[0029] like Figure 1 As shown, the range extender assembly includes a coupling 9, and both ends of the coupling 9 are connected to the output shaft of the engine 1 and the planet carrier 83 respectively.

[0030] Specifically, the coupling 9 is an elastic coupling, which is beneficial to reducing the torsional vibration of the connection between the output shaft of the engine 1 and the planetary carrier 83 and improving the reliability of the connection.

[0031] like Figure 1 As shown, the engineering machinery includes a generator 2, a drive motor 3 and a battery 4, any two of the generator 2, the drive motor 3 and the battery 4 are electrically connected, and the sun gear 84 of the transfer case 8 is drivingly connected to the input shaft of the generator 2.

[0032] Specifically, the generator 2 of the present invention is a high-speed generator (as the speed of the generator increases, the torque will decrease and the volume can be reduced), which can rotate at a speed ratio of twice or more than the speed of the engine 1 to achieve high-speed power generation.

[0033] like Figure 1 As shown, the present invention also provides an engineering machine, including the above-mentioned range extender assembly, the engineering machine also includes a hydraulic pump 5, a steering mechanism 6 and a lifting mechanism 7, the outlet of the hydraulic pump 5 is connected to the inlet of the steering mechanism 6 and the inlet of the lifting mechanism 7, and the planetary gear 85 of the transfer case 8 is transmission-connected to the input shaft of the hydraulic pump 5.

[0034] Specifically, the planetary gear 85 of the transfer case 8 is connected to the input shaft of the hydraulic pump 5 through a double-sided ring gear 86 and a driven gear 87 .

[0035] like Figure 1 As shown, the engineering machine includes a steering control valve 10 , the outlet of the hydraulic pump 5 is connected to the inlet of the steering mechanism 6 via the steering control valve 10 , and the outlet of the steering mechanism 6 is connected to the inlet of the hydraulic pump 5 .

[0036] like Figure 1 As shown, the engineering machinery includes a lifting control valve 11 , the outlet of the hydraulic pump 5 and the inlet of the lifting mechanism 7 are connected via the lifting control valve 11 , and the outlet of the lifting mechanism 7 is connected to the inlet of the hydraulic pump 5 .

[0037] In this way, the engineering machinery of the present invention eliminates the no-load oil return path of the steering mechanism 6 and the lifting mechanism 7, and provides a steering control valve 10 and a lifting control valve 11 to respectively control the hydraulic oil flowing from the hydraulic pump 5 to the steering mechanism 6 and the lifting mechanism 7, so that the corresponding steering control valve 10 and the lifting control valve 11 are opened when the steering mechanism 6 and the lifting mechanism 7 are working, and the corresponding steering control valve 10 and the lifting control valve 11 are closed when the steering mechanism 6 and the lifting mechanism 7 are not working, and the hydraulic pump 5 is stopped when the steering mechanism 6 and the lifting mechanism 7 are not working, thereby avoiding the idling phenomenon of the hydraulic pump 5, solving the problem in the prior art that the valve of the pressure relief valve controlling the return of the hydraulic oil is always in the standby open state, the hydraulic pump needs to work all the time and the hydraulic oil needs to flow continuously, thereby resulting in a large energy consumption of the engineering machinery, thereby saving the amount of fuel required for the engineering machinery.

[0038] The engineering machinery of the present invention can realize the following multiple working modes by controlling the on-off of the steering control valve 10 and the lifting control valve 11:

[0039] (1) The steering control valve 10 and the lift control valve 11 are both closed, so that the double-sided gear ring 86 does not rotate and the hydraulic oil does not flow. The full speed of the engine 1 acts on the generator 2 through the planetary carrier 83, the planetary gear 85 and the sun gear 84 in sequence, so that the generator 2 generates electricity at a higher speed.

[0040] (2) The lifting control valve 11 is opened, the lifting hydraulic oil circuit between the hydraulic pump 5 and the lifting mechanism 7 is connected, and the engine 1 drives the double-sided gear ring 86 to rotate through the planetary carrier 83 and the planetary gear 85, so that the driven wheel 87 and the hydraulic pump 5 work, so that the lifting mechanism 7 starts to work, and the engineering machinery generates electricity and lifts at the same time; among them, the speed change demand of the hydraulic pump 5 can be quickly responded to by adjusting the torque and speed of the generator 2.

[0041] (3) The steering control valve 10 and the lifting control valve 11 are opened at the same time, and the engine 1 drives the double-sided gear ring 86 to rotate through the planetary carrier 83 and the planetary gear 85, so that the driven wheel 87 and the hydraulic pump 5 work, so that the steering mechanism 6 and the lifting mechanism 7 start to operate, and the engineering machinery generates electricity, lifts and steers at the same time; among them, when the power supply of the generator 2 to the drive motor 3 is insufficient, the battery 4 can supplement the power supply to the drive motor 3.

[0042] The control method of the engineering machinery of the present utility model is as follows:

[0043] (1) The pressure of the hydraulic pump 5 is related to its own torque, and the flow rate of the hydraulic pump 5 is related to its own rotational speed.

[0044] (2) The engine 1 outputs a certain speed and torque in the high-efficiency zone to act on the planetary carrier 83, and the generator 2 receives the corresponding speed and torque through the sun gear 84; when at least one of the steering control valve 10 and the lifting control valve 11 is opened, the hydraulic pump 5 receives the corresponding speed and torque through the driven wheel 87, and the corresponding speed of the double-sided gear ring 86 can be adjusted by adjusting the speed of the generator 2; when the steering control valve 10 and the lifting control valve 11 are all closed, the speed of the double-sided gear ring 86 is zero, and the speed of the generator 2 reaches the maximum.

[0045] (3) When one of the steering control valve 10 and the lifting control valve 11 is opened, the corresponding steering mechanism 6 or lifting mechanism 7 starts to operate. At this time, the required flow of the hydraulic pump 5 is small, and the generator 2 can quickly reduce the speed so that the double-sided gear ring 86 starts to rotate at a lower speed.

[0046] (4) When the required flow rate of the hydraulic pump 5 is large, the coordinated torque of the generator 2 and the engine 1 can be appropriately adjusted to achieve torque adjustment of the double-sided gear ring 86, thereby adjusting the torque of the hydraulic pump 5.

[0047] (5) When the other one of the steering control valve 10 and the lifting control valve 11 is opened, the required flow of the hydraulic pump 5 increases, and the generator 2 quickly reduces its speed to accelerate the rotation of the double-sided gear ring 86, thereby increasing the speed of the hydraulic pump 5 to output a larger flow; when the steering control valve 10 and the lifting control valve 11 are closed, the speed of the generator 2 increases.

[0048] (6) When the generator 2 does not supply enough power to the drive motor 3 and the battery 4 has sufficient power, the battery 4 will provide additional power to the drive motor 3. When the generator 2 does not supply enough power to the drive motor 3 and the battery 4 has insufficient power, the speed of the engine 1 and the generator 2 can be appropriately increased.

[0049] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0050] The transfer case of the present invention is suitable for a range extender assembly of engineering machinery. The range extender assembly includes an engine 1 and a generator 2. The engineering machinery includes a hydraulic pump 5. The transfer case includes: a transfer case 8. The transfer case 8 includes a housing 81 and a planetary gear assembly 82 located in the housing 81. The planetary gear assembly 82 includes a planet carrier 83, a sun gear 84 and a plurality of planetary gears 85. The plurality of planetary gears 85 are arranged at intervals around the outer circumference of the sun gear 84. Each planetary gear 85 is mounted on the planet carrier 83 and meshes with the sun gear 84. Among them, the planet carrier 83 is connected to the output shaft of the engine 1, the sun gear 84 is connected to the input shaft of the generator 2 by driving connection, and the planetary gears 85 are connected to the input shaft of the hydraulic pump 5 by driving connection. In this way, the transfer case of the present invention is placed between the engine 1 and the generator 2 of the engineering machinery. By setting the planetary gear assembly 82, the setting similar to the two hydraulic motors used in the prior art is eliminated, and the low-speed input of the engine 1 and the high-speed output of the sun gear 84 are achieved, so that the purpose of using a high-speed generator with small torque and volume can be achieved, so that the speed adjustment of the generator 2 is faster and more responsive. By adjusting the speed of the generator 2, the speed of the hydraulic pump 5 can be changed when the speed of the engine 1 remains unchanged, thereby adjusting the flow and pressure of the hydraulic pump 5, etc., so that the speed of the engine 1 can operate in the economically friendly zone under different lifting powers, solving the problem that the engine of the range extender structure for engineering machinery in the prior art cannot always operate in the optimal efficiency range.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0053] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A transfer case, characterized in that: The transfer case is suitable for a range extender assembly of an engineering machine, the range extender assembly comprising an engine (1) and a generator (2), the engineering machine comprising a hydraulic pump (5), and the transfer case comprising: A transfer case, the transfer case comprising a housing (81) and a planetary gear assembly (82) located in the housing (81), the planetary gear assembly (82) comprising a planet carrier (83), a sun gear (84) and a plurality of planetary gears (85), the plurality of planetary gears (85) being arranged at intervals around the outer circumference of the sun gear (84), and each of the planetary gears (85) being mounted on the planet carrier (83) and meshing with the sun gear (84); The planet carrier (83) is connected to the output shaft of the engine (1), the sun gear (84) is drivingly connected to the input shaft of the generator (2), and the planet gear (85) is drivingly connected to the input shaft of the hydraulic pump (5).

2. The transfer case according to claim 1, characterized in that: The transfer case comprises a double-sided gear ring (86) and a driven wheel (87) located in the housing (81); the double-sided gear ring (86) is rotatably mounted on the housing (81); the double-sided gear ring (86) is sleeved outside the plurality of planetary wheels (85) and meshes with each of the planetary wheels (85); the driven wheel (87) is located outside the double-sided gear ring (86) and meshes with the double-sided gear ring (86); and the driven wheel (87) is connected to the input shaft of the hydraulic pump (5).

3. The transfer case according to claim 2, characterized in that: The transfer case comprises a bearing (88), and the double-sided gear ring (86) is rotatably connected to the housing (81) via the bearing (88).

4. A range extender assembly, characterized in that: It comprises an engine (1) and a transfer case (8), wherein the transfer case (8) is the transfer case described in any one of claims 1 to 3, and the output shaft of the engine (1) is drivingly connected to the planetary carrier (83) of the transfer case (8).

5. The range extender assembly according to claim 4, characterized in that: The range extender assembly comprises a coupling (9), and two ends of the coupling (9) are respectively connected to the output shaft of the engine (1) and the planet carrier (83).

6. The range extender assembly according to claim 5, characterized in that: The coupling (9) is an elastic coupling.

7. The range extender assembly according to claim 4, characterized in that: The engineering machinery comprises a generator (2), a drive motor (3) and a battery (4), any two of the generator (2), the drive motor (3) and the battery (4) are electrically connected, and the sun gear (84) of the transfer case (8) is drivingly connected to the input shaft of the generator (2).

8. An engineering machine, characterized in that: A range extender assembly comprising any one of claims 4 to 7, wherein the engineering machinery comprises a hydraulic pump (5), a steering mechanism (6) and a lifting mechanism (7), the outlet of the hydraulic pump (5) being connected to the inlet of the steering mechanism (6) and the inlet of the lifting mechanism (7), and the planetary gear (85) of the transfer case (8) of the range extender assembly being drivingly connected to the input shaft of the hydraulic pump (5).

9. The construction machine according to claim 8, characterized in that: The engineering machinery comprises a steering control valve (10), the outlet of the hydraulic pump (5) and the inlet of the steering mechanism (6) are connected via the steering control valve (10), and the outlet of the steering mechanism (6) is connected to the inlet of the hydraulic pump (5).

10. The engineering machine according to claim 8, characterized in that: The engineering machinery comprises a lifting control valve (11), the outlet of the hydraulic pump (5) and the inlet of the lifting mechanism (7) are connected via the lifting control valve (11), and the outlet of the lifting mechanism (7) is connected to the inlet of the hydraulic pump (5).

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