Differential assembly and truck crane

Abstract

The application belongs to the field of engineering machinery and discloses a transfer assembly and a truck crane. The transfer assembly comprises an oil pan, an oil temperature sensor for detecting an oil temperature value, a plurality of transmission shafts arranged in parallel above the oil pan and arranged in sequence in a height direction, and a lubricating pump group for pumping oil in the oil pan. The lubricating pump group comprises an auxiliary lubricating pump installed on a first transmission shaft with the highest position among the plurality of transmission shafts and a main lubricating pump installed on other transmission shafts. In the transfer assembly with a large reduction distance or the transfer assembly often in a heavy load working condition, a lubricating pump, which can be a gear pump or a variable pump, is added on the first transmission shaft with a higher position on the basis of the original lubricating pump, and the lubricating pump can be arbitrarily combined according to the demand of the whole machine. In addition, a logic control can be added to adjust the displacement of the pump and the working participation of the auxiliary pump according to the parameters such as the input rotating speed of the transfer assembly, so as to meet the lubricating demand of the transfer assembly in real time.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of engineering machinery, and particularly relates to a transfer assembly and a truck crane. BACKGROUND

[0002] The transfer assembly of the truck crane generally adopts a built-in lubricating pump form, that is, a gear pump is built in for lubrication. The lubricating pump is arranged at the shaft end of the transfer assembly at a high position, pumps the oil liquid at the bottom, and then pours from top to bottom to lubricate the gear pair and bearing and the like. However, for a large-tonnage truck crane, the size specification of the transfer assembly is larger, the position of the lubricating pump is higher, and the pumping requirement of the oil liquid at the bottom is greater. When the crane is running at a heavy load and a low speed, especially in an off-road mode, the rotational speed transmitted by the engine to the gear pump of the transfer assembly is relatively low, which leads to poor driving capacity of the gear pump, that is, poor oil pumping capacity, and even the oil liquid cannot be pumped up, so that the internal lubrication of the transfer assembly is insufficient or even cannot be achieved.

[0003] In addition, when the crane is running at a heavy load, the working torque of the transfer assembly is greater, the working load of the gear and bearing is greater, and the heat generation is also greater, so that there is a greater heat dissipation requirement. At this time, if the lubrication is insufficient, the gear or bearing inside the transfer assembly is prone to high temperature or even sintering, which damages the transfer assembly and causes a parking failure. SUMMARY

[0004] The purpose of the present application is to provide a transfer assembly and a truck crane to enhance the internal lubrication of the transfer assembly and improve the working performance of the whole machine.

[0005] To achieve the above purpose, the present application provides a transfer assembly, comprising:

[0006] An oil sump is provided with an oil temperature sensor for detecting an oil temperature value;

[0007] A plurality of transmission shafts are arranged above the oil sump in parallel and are arranged in sequence in the height direction;

[0008] A lubricating pump group is used to pump the oil liquid of the oil sump, and the lubricating pump group comprises an auxiliary lubricating pump installed on a first transmission shaft which is the highest among the plurality of transmission shafts and a main lubricating pump installed on the other transmission shafts.

[0009] In some embodiments, the auxiliary lubricating pump is a variable pump; the first transmission shaft is provided with an input rotational speed sensor for collecting a transfer input rotational speed, the transfer assembly comprises a controller electrically connected with the auxiliary lubricating pump, the oil temperature sensor and the input rotational speed sensor, and the controller is used to adjust the displacement of the auxiliary lubricating pump according to the transfer input rotational speed and the detected oil temperature value.

[0010] In some embodiments, the main lubrication pump is a variable displacement pump; the transfer case assembly is provided with a driving speed sensor for collecting the vehicle's driving speed, and the transfer case assembly includes a controller electrically connected to the main lubrication pump, the oil temperature sensor and the driving speed sensor, and the controller is used to adjust the displacement of the variable displacement pump according to the vehicle's driving speed and the detected oil temperature value.

[0011] In some embodiments, the plurality of transmission shafts include the first transmission shaft as the input shaft and a second transmission shaft disposed immediately below the first transmission shaft, and the main lubrication pump is mounted on the second transmission shaft.

[0012] In some embodiments, among the plurality of transmission shafts, a step-down distance between the first transmission shaft at the highest position and the Nth transmission shaft at the lowest position is not less than 750 mm, where N is an integer not less than 3.

[0013] In some embodiments, the transfer case assembly includes a controller configured to:

[0014] Obtaining the oil temperature value detected by the oil temperature sensor;

[0015] Determine that the detected oil temperature value is less than the maximum operating oil temperature T allowed for short-term operation a ;

[0016] Control vehicle start;

[0017] Determine that the detected oil temperature value is not less than the maximum operating oil temperature T allowed for short-term operation a ;

[0018] Issue an alarm and / or perform restricted operations.

[0019] In some embodiments, the transfer case assembly is provided with a driving speed sensor for collecting the driving speed of the vehicle, and the controller is further configured to:

[0020] Determine whether the detected oil temperature value is less than the maximum continuous operating oil temperature T p ;

[0021] Control vehicle start;

[0022] obtaining the vehicle speed detected by the speed sensor;

[0023] Determining that the vehicle's running speed is not less than a minimum stable vehicle speed V0 corresponding to the operation of the main lubrication pump alone to meet lubrication needs;

[0024] Only the main lubrication pump is controlled to operate.

[0025] In some embodiments, the controller is further configured to:

[0026] Determining that the vehicle speed is less than a minimum stable vehicle speed V0 corresponding to the operation of the main lubrication pump alone to meet lubrication needs;

[0027] Controlling and starting the auxiliary lubrication pump to work together with the main lubrication pump;

[0028] After determining that only the main lubrication pump is working for the set duration, the detected oil temperature value is greater than the maximum operating oil temperature T a ;

[0029] Controlling and starting the auxiliary lubrication pump to work together with the main lubrication pump;

[0030] After determining that only the main lubrication pump is working for the set duration, the detected oil temperature value is not greater than the allowable continuous minimum operating oil temperature T L ;

[0031] Issue an alarm and / or perform restricted operations.

[0032] In some embodiments, the controller is further configured to:

[0033] Determine whether the detected oil temperature value is greater than the maximum continuous operating oil temperature T p And less than the maximum operating oil temperature T allowed for short-term operation a ;

[0034] Control vehicle start;

[0035] The main lubrication pump and the auxiliary lubrication pump are controlled to work together.

[0036] In some embodiments, the controller is further configured to:

[0037] After determining that the main lubrication pump and the auxiliary lubrication pump work together for a set duration, the detected oil temperature value is less than the maximum allowable continuous working oil temperature T p ;

[0038] Controlling to shut down the auxiliary lubrication pump;

[0039] After the main lubrication pump and the auxiliary lubrication pump work together for a set duration, the detected oil temperature value is not less than the maximum allowable continuous working oil temperature T p And less than the maximum operating oil temperature T allowed for short-term operation a ;

[0040] Controlling and maintaining the main lubrication pump and the auxiliary lubrication pump to work together;

[0041] After determining that the main lubrication pump and the auxiliary lubrication pump work together for a set duration, the detected oil temperature value is not less than the maximum operating oil temperature T allowed for short-term operation a ;

[0042] Issue an alarm and / or perform restricted operations.

[0043] In addition, the present application also discloses a truck crane, which includes the above-mentioned transfer case assembly.

[0044] The transfer case assembly of the present application is equipped with at least two lubrication pumps, forming a lubrication pump group, one of which is a normally open main lubrication pump, and the other is a spare auxiliary lubrication pump, which can be turned on and off at the appropriate time according to the working conditions. The main and auxiliary oil pumps can work together individually or in combination to adjust the lubrication capacity, provide an appropriate amount of pump suction, and pump the hydraulic oil in the oil pan to the first transmission shaft at the highest position, and then pour it downward to the various components in the transfer case to achieve sufficient lubrication. Further, logic control can be added to adjust the pump displacement according to parameters such as the transfer case input speed and oil temperature, as well as adjust and control the working participation of the auxiliary pump to meet the lubrication needs of the transfer case in real time and maintain an energy-saving state.

[0045] Other advantages of the present application and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings are used to provide an understanding of the present application and constitute a part of the specification. Together with the following detailed description, they are used to explain the present application but do not constitute a limitation of the present application. In the accompanying drawings:

[0047] Figure 1 is a structural schematic diagram of a transfer case assembly according to a specific embodiment of the present application;

[0048] Figure 2 Schematic diagram of control steps of a controller in a transfer case assembly according to a specific embodiment of the present application;

[0049] Figure 3 It is a logic control block diagram of a controller in a transfer case assembly according to a specific embodiment of the present application.

[0050] Description of Reference Numerals

[0051] 1 First transmission shaft 2 Second transmission shaft

[0052] 3 Third transmission shaft 4 Nth transmission shaft

[0053] 5 Main lubrication pump 6 Auxiliary lubrication pump

[0054] 7 Highway gear pair 8 Off-road gear pair

[0055] 9 Oil pan 10 Oil temperature sensor

[0056] 11 Input speed sensor 12 Driving speed sensor DETAILED DESCRIPTION

[0057] The following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0058] The transfer case assembly and the truck crane of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0059] This application discloses a new type of transfer case assembly. Figure 1 As shown, in a specific embodiment, the transfer case assembly includes:

[0060] The oil pan 9 is provided with an oil temperature sensor 10 for detecting the oil temperature value;

[0061] A plurality of transmission shafts are arranged above the oil pan 9 in parallel with each other and are spaced apart in sequence along the height direction;

[0062] The lubrication pump group is used to pump the oil in the oil pan 9. The lubrication pump group includes an auxiliary lubrication pump 6 installed on the first transmission shaft 1 which is the highest among the multiple transmission shafts, and a main lubrication pump 5 installed on the other transmission shafts.

[0063] The transfer case assembly of the present application is equipped with a lubrication pump group, namely at least two lubrication pumps, one of which is a normally open main lubrication pump 5, and the other can be a spare auxiliary lubrication pump 6, which can be turned on and off according to the working conditions (such as oil temperature, main pump drive speed, etc.). Among them, while keeping the installation position of the main lubrication pump 5 basically unchanged, the auxiliary lubrication pump 6 is preferably installed on the first transmission shaft 1 at the highest position, so that when the hydraulic oil pumped from the oil pan 9 by the auxiliary lubrication pump 6 is poured downward, the lubrication oil contact surface can cover more parts and meshing surfaces. It can be seen that adding a lubrication pump to the first transmission shaft 1 at the highest point can improve the lubrication capacity and make the internal lubrication of the transfer case more sufficient. The lubrication pump group can adopt a metering pump or a variable pump, such as a gear pump or an electronic pump, etc. The number of auxiliary lubrication pumps 6 is not limited to one, and can be more.

[0064] It should be noted that the transfer case assembly of the present application is particularly suitable for large truck cranes. Generally, for ordinary truck cranes, the transfer cases they use are mostly three-axis and four-axis types, and the height difference between the input shaft and the output shaft (i.e., the step-down distance) is 400mm to 750mm. When the step-down distance is not large and the transfer case input speed is high, a single gear pump is sufficient as a lubrication pump for lubrication purposes. However, for large truck cranes, the transfer cases they use are mostly four-axis or more, and among the multiple transmission shafts, such as Figure 1 As shown, the drop distance between the first transmission shaft 1 at the highest position and the Nth transmission shaft 4 at the lowest position is generally not less than 750 mm. Wherein, N is an integer not less than 3, Figure 1 Where N is equal to 4, this represents a four-axis transfer case. For transfer cases with a drop distance of 750mm or more, a single lubrication pump cannot adequately lubricate the transfer case when the crane is heavily loaded and operating at low speed, especially in off-road mode. In this case, the lubrication pump assembly of the present application, equipped with a main lubrication pump 5 and an auxiliary lubrication pump 6, is capable of pumping more hydraulic oil from the oil pan 9 for use as lubricant, thereby lubricating the gear pairs and bearings within the transfer case. Furthermore, the auxiliary pumps can be activated or the displacement of each pump adjusted to meet the lubrication requirements of the operating conditions, thereby achieving energy savings.

[0065] In some embodiments, the auxiliary lubrication pump 6 can be a variable displacement pump. In this case, an input speed sensor 11 for detecting the transfer case input speed can be installed on the first transmission shaft 1. The transfer case assembly includes a controller electrically connected to the auxiliary lubrication pump 6, the oil temperature sensor 10, and the input speed sensor 11. The controller is configured to adjust the displacement of the auxiliary lubrication pump 6 based on the transfer case input speed and the detected oil temperature. As can be seen, when a variable displacement pump is used, variable regulation can be implemented. The auxiliary pump is mounted on the input shaft, and the displacement increases with the input speed. The displacement, or flow rate, can be adjusted as needed, eliminating the need for the pump to operate at full capacity, reducing heat generation and achieving energy savings. For example, when the transfer case input speed is high and the detected oil temperature is low, the pump displacement can be reduced to meet lubrication requirements.

[0066] Similarly, when the main lubrication pump 5 is a variable displacement pump, the transfer case assembly can be equipped with a speed sensor 12 for detecting vehicle speed. The transfer case assembly includes a controller electrically connected to the main lubrication pump 5, the oil temperature sensor 10, and the speed sensor 12. The controller is configured to adjust the displacement of the variable displacement pump based on the vehicle speed and the detected oil temperature. The speed sensor 12 can be mounted on the output shaft of the transfer case to detect and provide feedback on the vehicle's speed. When the main lubrication pump 5 is a variable displacement pump, the displacement can also be adjusted downwards based on whether the pumped oil meets lubrication requirements.

[0067] Of course, both the main lubrication pump 5 and the auxiliary lubrication pump 6 may be variable displacement pumps, thereby enabling more flexible control logic and more flexible displacement adjustment, which will not be elaborated here.

[0068] exist Figure 1 In the embodiment, the plurality of transmission shafts include a first transmission shaft 1 as an input shaft and a second transmission shaft 2 arranged immediately below the first transmission shaft 1, and the main lubrication pump 5 is installed on the second transmission shaft 2. Alternatively, the main lubrication pump 5 can also be installed on the third transmission shaft 3 or the Nth transmission shaft 4. Specifically, in Figure 1 In this system, a second lubrication pump is externally or internally connected to the rear end of the first drive shaft (the highest shaft in the transfer case). This pump coordinates with the oil pump at the front end of the second drive shaft (2) to meet the transfer case's overall lubrication needs under all operating conditions. Both pumps can utilize long-mesh gear pumps (i.e., metered-displacement pumps). Both pumps contribute to the entire transfer case's operation, improving lubrication capacity compared to a single pump. Alternatively, the gear pump can remain on the second drive shaft (2), while a variable displacement pump can be used on the first drive shaft (1). With the addition of logic control, the operating state or flow rate of the pump on the first drive shaft (1) can be adjusted based on the transfer case oil temperature and vehicle speed. This reduces the need for the pump to operate at full capacity, generating less heat and achieving energy savings. Alternatively, a variable displacement pump can be used on the second drive shaft (2), while a variable displacement pump can also be used on the first drive shaft (1). With the addition of logic control, the flow rate of the pumps on the first and second drive shafts (1 and 2) can be adjusted based on the transfer case oil temperature and vehicle speed. This reduces the need for both pumps to operate at full capacity, generating less heat and achieving energy savings. Alternatively, a variable pump can be used on the second transmission shaft 2, and a gear pump can be used on the first transmission shaft 1, and logic control can be added to adjust the flow of the pump on the second transmission shaft 2 according to the transfer case oil temperature and the vehicle speed. Similarly, the pump does not have to work at full load all the time, generating less heat and achieving energy saving.

[0069] exist Figure 1 In the case of a four-axis transfer case, when the operating conditions are good, such as when the entire machine is mostly under light load, or when the transfer case's drop is not too large, the main lubrication pump 5 on the second drive shaft 2 can fully meet the transfer case's internal heat dissipation needs, and there is no need to start the auxiliary lubrication pump 6. However, under certain operating conditions, if the transfer case is insufficiently lubricated for any reason, the lubricating oil temperature in the oil pan 9 will inevitably become too high. Excessive oil temperature will inevitably further deteriorate the lubrication system, significantly increasing the risk of damage to the transfer case. To this end, the transfer case assembly of the present application includes a controller. The controller logically controls the lubrication pump group, that is, controls the operating state or speed of the lubrication pump based on detected parameters such as oil temperature and speed, thereby meeting the transfer case's lubrication needs and ensuring that the transfer case receives sufficient lubrication without causing the aforementioned damage risks.

[0070] For example, see Figure 3 , the controller can be configured as:

[0071] obtaining a detected oil temperature value of the oil temperature sensor 10;

[0072] determining that the detected oil temperature value is less than a permissible short-time working maximum working oil temperature T a ;

[0073] controlling the vehicle to start;

[0074] determining that the detected oil temperature value is not less than a permissible short-time working maximum working oil temperature T a ;

[0075] issuing an alarm prompt and / or performing a limiting operation.

[0076] It can be seen that the premise of normal starting of the truck crane is that the oil temperature signal of the transfer case must be detected. After the whole vehicle is powered on, the oil temperature value of the lubricating oil in the oil pan 9 is detected by the oil temperature sensor 10, and comparison is made. When the detected oil temperature value is less than a permissible short-time working maximum working oil temperature T a , the vehicle can be controlled to start, and when the detected oil temperature value is not less than a permissible short-time working maximum working oil temperature T a , an alarm prompt needs to be issued and / or a limiting operation needs to be performed.

[0077] The alarm prompt can be in the form of voice, signal indicator light or fault code, etc. The limiting operation can include limiting the starting of the whole vehicle, limiting the gear, limiting the maximum driving speed of the vehicle, limiting the continuous driving distance of the vehicle before the fault is cleared, etc.

[0078] The transfer case assembly can also be provided with a driving speed sensor 12 for collecting the driving speed of the vehicle, and at this time the controller can also be configured to:

[0079] determining that the detected oil temperature value is less than a permissible continuous maximum working oil temperature T p ;

[0080] controlling the vehicle to start;

[0081] obtaining the driving speed of the vehicle detected by the driving speed sensor 12;

[0082] determining that the driving speed of the vehicle is not less than a minimum stable vehicle speed V0 corresponding to the working of only the main lubricating pump 5 to meet the lubrication needs;

[0083] controlling the working of only the main lubricating pump 5.

[0084] Referring to the left half of Figure 3 , when the oil temperature is detected, if the detected oil temperature value is not only less than a permissible short-time working maximum working oil temperature T a , but also less than a permissible continuous maximum working oil temperature T pWhen the vehicle is started, the vehicle speed can be obtained first, and by comparison, it is found that the vehicle speed is not less than the minimum stable vehicle speed V0 corresponding to the main lubrication pump 5 working alone to meet the lubrication needs. At this time, only the main lubrication pump 5 working alone can meet the transfer case lubrication needs without starting the auxiliary lubrication pump 6.

[0085] When the main lubrication pump 5 works alone, under certain working conditions, it is necessary to start the auxiliary lubrication pump 6 to work together. Figure 2 , the controller can also be configured to:

[0086] S100, determining that the vehicle speed is less than the minimum stable vehicle speed V0 corresponding to the operation of the main lubrication pump 5 alone to meet the lubrication needs;

[0087] S200, control and start the auxiliary lubrication pump 6, working together with the main lubrication pump 5;

[0088] S300, after determining that only the main lubrication pump 5 works for the set duration, the oil temperature is greater than the maximum operating oil temperature T allowed for short-term operation. a ;

[0089] S400, control and start the auxiliary lubrication pump 6, working together with the main lubrication pump 5;

[0090] S500: After determining that only the main lubrication pump 5 is working for the set duration, the oil temperature is not greater than the allowed minimum continuous working oil temperature T L ;

[0091] S600: Issue an alarm and / or perform a restriction operation.

[0092] The above control logic corresponds to the situation where only the main lubrication pump 5 is working, and the auxiliary lubrication pump 6 is started, or an alarm is issued. Figure 2 After the vehicle is powered on and the oil temperature is tested, if only the main lubrication pump 5 needs to work alone, steps S100 and S200 can be executed. That is, if the vehicle speed is less than the minimum stable vehicle speed V0 corresponding to the main lubrication pump 5 working alone to meet the lubrication needs, this means that the input speed of the transfer case is insufficient to drive the main lubrication pump 5 to meet the pumping demand, and the auxiliary lubrication pump 6 needs to be started in time. If steps S100 and S200 are not required, that is, the vehicle speed is not less than the minimum stable vehicle speed V0 and meets the requirements, steps S300 and S400 are executed. After the main lubrication pump 5 has worked for the set duration, the oil temperature is tested. If the detected oil temperature value is greater than the maximum operating oil temperature T allowed for short-term operation a , which means that the main lubrication pump 5 working alone cannot achieve the preset lubrication and cooling effect. At this time, the auxiliary lubrication pump 6 should also be introduced to work together to enhance the lubrication effect. Finally, if there is no need to perform steps S100 to S400, refer to Figure 3The lower left part of the oil temperature sensor is shown in FIG5 , and then steps S500 and S600 are executed. After only the main lubrication pump 5 works for a period of time, if the detected oil temperature value is not greater than the allowed continuous minimum operating oil temperature T L , an alarm will be issued and / or restricted operations will be performed.

[0093] Similarly, see Figure 3 The right half of the controller can also be configured as:

[0094] Make sure the detected oil temperature is greater than the maximum allowable continuous operating oil temperature T p And less than the maximum operating oil temperature T allowed for short-term operation a ;

[0095] Control vehicle start;

[0096] The main lubrication pump 5 and the auxiliary lubrication pump 6 are controlled to work together.

[0097] This control logic limits the scenario where the main and auxiliary pumps work together, that is, the first oil temperature detection after the vehicle is powered on. If the detected oil temperature value is greater than the maximum continuous operating oil temperature T p And less than the maximum operating oil temperature T allowed for short-term operation a , when controlling the vehicle to start, considering that the oil temperature is high, it is necessary to start the main lubrication pump 5 and the auxiliary lubrication pump 6 to work together to improve the lubrication capacity. At this time, it is not appropriate for only the main lubrication pump 5 to work alone.

[0098] Similarly, when the main and auxiliary pumps work together, the controller can also be configured as follows:

[0099] After the main lubrication pump 5 and the auxiliary lubrication pump 6 work together for the set duration, the detected oil temperature value is less than the maximum continuous operating oil temperature T p ;

[0100] Control to shut down the auxiliary lubrication pump 6;

[0101] After the main lubrication pump 5 and the auxiliary lubrication pump 6 work together for the set duration, the oil temperature is not less than the maximum allowable continuous working oil temperature T p And less than the maximum operating oil temperature T allowed for short-term operation a ;

[0102] Control to keep the main lubrication pump 5 and the auxiliary lubrication pump 6 working together;

[0103] After the main lubrication pump 5 and the auxiliary lubrication pump 6 work together for the set duration, the oil temperature is not less than the maximum operating oil temperature T a ;

[0104] Issue an alarm and / or perform restricted operations.

[0105] It can be seen that the above control logic realizes the on / off control and alarm control of the auxiliary pump in the scenario where the main and auxiliary pumps work together. After the main and auxiliary pumps work together for a set period of time, the oil temperature can be detected. If the oil temperature drops to T p Below, the auxiliary lubrication pump 6 can be turned off and the auxiliary lubrication pump 6 is not required to continue to participate. p With T a If the oil temperature rises, it should not be less than the maximum working oil temperature T a When the alarm is triggered, an alarm prompt will be issued and / or restricted operations will be performed.

[0106] It should be noted that in Figure 3 The parameters in are: transfer case input speed n, the minimum continuous operating oil temperature allowed is T L , the maximum continuous operating oil temperature allowed is T p The maximum operating oil temperature allowed for short-term operation is T a The minimum stable vehicle speed corresponding to the operation of the main lubrication pump 5 alone to meet the basic lubrication needs of the transfer case is V0.

[0107] It can be seen that as long as the transfer case continues to work and the sensor is normal, the transfer case oil temperature cannot be lower than T L The premise for the cab alarm to simultaneously restrict the relevant operations of the vehicle is that the transfer case continues to work and the oil temperature T<T L Or the transfer case works, keep the main and auxiliary oil pumps working continuously, but the transfer case oil temperature T>T a .

[0108] In summary, this application allows for the addition of a lubrication pump, located higher up on the first drive shaft, in addition to the existing lubrication pump, in transfer cases with large step-down distances or those frequently subjected to heavy loads. The existing and additional pumps can be gear pumps or variable displacement pumps, or any combination can be used to meet the overall requirements. Furthermore, logic control is added to adjust the pump's displacement based on parameters such as the transfer case's input speed, as well as to adjust and control the operation of the auxiliary pump to meet the transfer case's lubrication needs in real time.

[0109] On this basis, the present application also discloses a truck crane, comprising the above-mentioned transfer case assembly.

[0110] In off-road mode, the transfer case's output speed is lower than its input speed for large-tonnage truck cranes. Under these conditions, the vehicle's speed is low, the transfer case's load is greater, and the resulting heat generation and lubrication requirements are higher. However, the transfer case's input speed is typically lower. When the existing gear pump is used as the primary lubrication pump, the pump's speed decreases, reducing its oil pumping capacity and worsening the transfer case's internal lubrication environment. To address this, the present application incorporates two or more lubrication pumps within the transfer case. Based on the transfer case's capacity, one pump serves as the primary pump and one as an auxiliary pump, with the primary pump taking priority to ensure lubrication is met and, on this basis, energy conservation is minimized.

[0111] For transfer cases with large dropouts or those with frequent heavy loads, adding a lubrication pump as an auxiliary pump to the first drive shaft (the shaft at the highest point of the transfer case) can enhance lubrication capacity and provide more complete lubrication within the transfer case. When using a variable displacement pump, logic control can be added to adjust the pump flow rate based on the transfer case input speed, eliminating the need for the pump to operate at full capacity, generating less heat and ultimately saving energy.

[0112] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0113] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0115] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A transfer case assembly, characterized in that: The transfer case assembly includes: The oil pan (9) is provided with an oil temperature sensor (10) for detecting the oil temperature value; A plurality of transmission shafts are arranged above the oil pan (9) in parallel with each other and are arranged in sequence at intervals along the height direction; a lubrication pump group for pumping oil from the oil pan (9), the lubrication pump group comprising an auxiliary lubrication pump (6) installed on the first transmission shaft (1) located highest among the plurality of transmission shafts, and a main lubrication pump (5) installed on the other transmission shafts; The transfer case assembly is provided with a driving speed sensor (12) for collecting the driving speed of the vehicle, and the transfer case assembly includes a controller configured to: Determine whether the detected oil temperature value is less than the maximum continuous operating oil temperature T p ; Control vehicle start; Obtaining the vehicle's travel speed detected by the travel speed sensor (12); Determining that the vehicle's running speed is not less than the minimum stable vehicle speed V0 corresponding to the lubrication requirement being met when only the main lubrication pump (5) is operating; Only the main lubrication pump (5) is controlled to operate.

2. The transfer case assembly according to claim 1, characterized in that: The auxiliary lubrication pump (6) is a variable displacement pump; an input speed sensor (11) for collecting the input speed of the transfer case is provided on the first transmission shaft (1); the transfer case assembly includes a controller electrically connected to the auxiliary lubrication pump (6), the oil temperature sensor (10) and the input speed sensor (11); the controller is used to adjust the displacement of the auxiliary lubrication pump (6) according to the input speed of the transfer case and the detected oil temperature value.

3. The transfer case assembly according to claim 1, characterized in that: The main lubrication pump (5) is a variable displacement pump; the transfer case assembly is provided with a driving speed sensor (12) for collecting the driving speed of the vehicle; the transfer case assembly includes a controller electrically connected to the main lubrication pump (5), the oil temperature sensor (10) and the driving speed sensor (12); the controller is used to adjust the displacement of the main lubrication pump (5) according to the driving speed of the vehicle and the detected oil temperature value.

4. The transfer case assembly according to claim 1, characterized in that: The plurality of transmission shafts include the first transmission shaft (1) serving as an input shaft and a second transmission shaft (2) arranged immediately below the first transmission shaft (1), and the main lubrication pump (5) is mounted on the second transmission shaft (2).

5. The transfer case assembly according to claim 1, characterized in that: Among the plurality of transmission shafts, the distance between the first transmission shaft (1) at the highest position and the Nth transmission shaft (4) at the lowest position is not less than 750 mm, and N is an integer not less than 3.

6. The transfer case assembly according to any one of claims 1 to 5, characterized in that: The controller is configured to: Obtaining the oil temperature value detected by the oil temperature sensor (10); Determine that the detected oil temperature value is less than the maximum operating oil temperature T allowed for short-term operation a ; Control vehicle start; Determine that the detected oil temperature value is not less than the maximum operating oil temperature T allowed for short-term operation a ; Issue an alarm and / or perform restricted operations.

7. The transfer case assembly according to claim 6, characterized in that: The controller is further configured to: Determining that the vehicle's running speed is less than a minimum stable vehicle speed V0 corresponding to the lubrication requirement being met when only the main lubrication pump (5) is operating; Controlling and starting the auxiliary lubrication pump (6) to work together with the main lubrication pump (5); After determining that only the main lubrication pump (5) works for the set duration, the detected oil temperature value is greater than the maximum operating oil temperature T a ; Controlling and starting the auxiliary lubrication pump (6) to work together with the main lubrication pump (5); After determining that only the main lubrication pump (5) works for the set duration, the detected oil temperature value is not greater than the allowed continuous minimum operating oil temperature T L ; Issue an alarm and / or perform restricted operations.

8. The transfer case assembly according to claim 6, characterized in that: The controller is further configured to: Determine whether the detected oil temperature value is greater than the maximum continuous operating oil temperature T p And less than the maximum operating oil temperature T allowed for short-term operation a ; Control vehicle start; The main lubrication pump (5) and the auxiliary lubrication pump (6) are controlled to work together.

9. The transfer case assembly according to claim 8, characterized in that: The controller is further configured to: After determining that the main lubrication pump (5) and the auxiliary lubrication pump (6) work together for a set duration, the detected oil temperature value is less than the allowed continuous maximum operating oil temperature T p ; Controlling to shut down the auxiliary lubrication pump (6); After determining that the main lubrication pump (5) and the auxiliary lubrication pump (6) work together for a set duration, the detected oil temperature value is not less than the allowed continuous maximum operating oil temperature T p And less than the maximum operating oil temperature T allowed for short-term operation a ; Controlling and maintaining the main lubrication pump (5) and the auxiliary lubrication pump (6) to work together; After determining that the main lubrication pump (5) and the auxiliary lubrication pump (6) work together for a set duration, the detected oil temperature value is not less than the maximum operating oil temperature T allowed for short-term operation. a ; Issue an alarm and / or perform restricted operations.

10. A truck crane, characterized in that: The truck crane includes the transfer case assembly according to any one of claims 1 to 9.

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