Transfer case assembly and automobile crane

Abstract

The invention belongs to the field of engineering machinery, and discloses a transfer case assembly and an automobile crane, and the transfer case assembly comprises an oil pan which is provided with an oil temperature sensor used for detecting the oil temperature value; the transmission shafts are arranged above the oil pan in parallel and are sequentially arranged at intervals in the height direction; the lubricating pump set is used for pumping oil in the oil pan, and the lubricating pump set comprises an auxiliary lubricating pump installed on the first transmission shaft at the highest position in the multiple transmission shafts and main lubricating pumps installed on the other transmission shafts. In a transfer case with a large drop distance or a transfer case frequently in a heavy load working condition, on the basis of an original lubricating pump, the lubricating pump is additionally arranged on the first transmission shaft at a higher position, and the lubricating pump can be a gear pump or a variable pump and can also be freely combined according to the requirements of the whole machine. In addition, logic control can be added, the displacement of the pump is adjusted according to parameters such as the input rotating speed of the transfer case, work participation of the auxiliary pump is adjusted and controlled, and the lubrication requirement of the transfer case is met in real time.

Description

Technical Field

[0001] The present application belongs to the field of engineering machinery, and in particular, relates to a transfer case assembly and a truck crane. Background Art

[0002] The transfer case assembly of a truck crane generally adopts a built-in lubrication pump, that is, a gear pump is built-in for lubrication. The lubrication pump is arranged at the shaft end at a higher position of the transfer case assembly, pumps the oil at the bottom, and then pours it from top to bottom to lubricate the gear pair and bearings, etc. However, for large-tonnage truck cranes, the size of the transfer case assembly is larger, the lubrication pump is located at a higher position, and the pumping force required for the bottom oil is greater. When the crane is traveling at a heavy load and low speed, especially in off-road mode, the speed transmitted by the engine to the gear pump of the transfer case is relatively low, resulting in poor driving ability of the gear pump, that is, poor oil pumping ability, or even the inability to pump the oil up, resulting in insufficient lubrication inside the transfer case, or even no lubrication at all.

[0003] In addition, when the crane is overloaded, the transfer case has a greater torque, the gears and bearings have a greater workload, and the heat generated is greater, requiring greater heat dissipation. If lubrication is insufficient at this time, it is easy to cause the internal gears or bearings of the transfer case to heat up or even sinter, damaging the transfer case and causing parking failures. Summary of the invention

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

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

[0006] The oil pan is provided with an oil temperature sensor for detecting the oil temperature value;

[0007] A plurality of transmission shafts are arranged above the oil pan in parallel with each other and are arranged in sequence and spaced apart in the height direction;

[0008] The lubrication pump group is used to pump the oil in the oil pan. The lubrication pump group includes an auxiliary lubrication pump installed on the first transmission shaft which is the highest among the multiple transmission shafts and a main lubrication pump installed on the other transmission shafts.

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

[0010] In some embodiments, the main lubrication pump is a variable 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 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 an 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 that the detected oil temperature value is less than the maximum allowable continuous operating oil temperature T p ;

[0021] Control vehicle start;

[0022] Acquiring the vehicle driving speed detected by the driving speed sensor;

[0023] Determine that the vehicle speed is not less than the minimum stable vehicle speed V corresponding to the operation of the main lubrication pump to meet the lubrication needs 0 ;

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

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

[0026] Determine that the vehicle speed is less than the minimum stable vehicle speed V corresponding to the operation of the main lubrication pump alone to meet the lubrication needs 0 ;

[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 works for the set duration, the detected oil temperature value is greater than the maximum operating oil temperature T allowed for short-term operation 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 works 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 that the detected oil temperature value 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 ;

[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 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 allowed continuous maximum operating 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 to form 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 started and operated in time according to the working conditions. The main and auxiliary oil pumps can work together alone or in combination to adjust the lubrication capacity, provide an appropriate amount of pump suction, and suck the hydraulic oil pump in the oil pan to the first transmission shaft at the highest position, and pour it downward to various components in the transfer case to achieve full lubrication. Further, logical 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 specific embodiments, they are used to explain the present application but do not constitute a limitation to the present application. In the accompanying drawings:

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

[0048] Figure 2 is a 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 specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present application and is not intended to limit the present application. It should be noted that, in the absence of conflict, the implementations in the present application and the features in the implementations can 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] The present application discloses a novel 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 arranged in sequence at intervals in 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, that is, 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 driving speed, etc.). Among them, while keeping the installation position of the main lubrication pump 5 basically unchanged, the auxiliary lubrication pump 6 is preferentially 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 use 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 pointed out 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 (i.e., step-down) between the input shaft and the output shaft is 400mm to 750mm. When the step-down is not large and the input speed of the transfer case 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, which is a four-axis transfer case. For a transfer case with a drop distance of more than 750mm, once the crane is heavily loaded and traveling at a low speed, especially in off-road mode, a single lubrication pump is difficult to fully lubricate the transfer case. At this time, the lubrication pump group equipped with a main lubrication pump 5 and an auxiliary lubrication pump 6 of the present application is capable of pumping more hydraulic oil from the oil pan 9 for use as lubricating oil to achieve the function of lubricating the gear pairs and bearings inside the transfer case, and can start the auxiliary pump in time according to the changes in the working conditions of the whole vehicle, or adjust the displacement of each pump by the opening, etc., to adapt to the lubrication requirements of the working conditions and achieve the purpose of energy saving.

[0065] In some embodiments, the auxiliary lubrication pump 6 may adopt a variable displacement pump; in this case, an input speed sensor 11 for collecting the input speed of the transfer case may be provided on the first transmission shaft 1, and 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, and 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. It can be seen that in the case of adopting a variable displacement pump, variable regulation can be implemented, and the auxiliary pump is installed on the input shaft. The greater the input speed, the greater the displacement of the auxiliary pump. The displacement can be adjusted in time according to the needs, that is, the flow rate of the pump is adjusted, so that the pump does not have to work at full load all the time, less heat is generated, and the purpose of energy saving is achieved. For example, when the input speed of the transfer case is large and the detected oil temperature value is low, the pump displacement can be reduced to meet the lubrication needs.

[0066] Similarly, when the main lubrication pump 5 adopts a variable displacement pump, the transfer case assembly may be provided with a driving speed sensor 12 for collecting the vehicle's driving speed. 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 variable displacement pump according to the vehicle's driving speed and the detected oil temperature value. Among them, the driving speed sensor 12 can be installed on the output shaft of the transfer case to detect and feedback the vehicle's driving speed. When the main lubrication pump 5 is a variable displacement pump, the displacement can also be adjusted down in time according to whether the pumped oil can meet the lubrication demand.

[0067] Of course, both the main lubrication pump 5 and the auxiliary lubrication pump 6 may adopt variable displacement pumps, so that more flexible control logic may be adopted to perform 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. Optionally, the main lubrication pump 5 may also be installed on the third transmission shaft 3 or the Nth transmission shaft 4. Specifically, in Figure 1 In the embodiment, another lubrication pump is externally or internally connected to the rear end of the first transmission shaft 1 (the shaft at the highest point of the transfer case), and works in coordination with the oil pump at the front end of the second transmission shaft 2 to meet the overall lubrication needs of the transfer case under all working conditions. Both pumps can use long meshing gear pumps (i.e., quantitative pumps), and the two oil pumps participate in the work of the transfer case throughout the process. At this time, the lubrication capacity will be improved compared with the case where only a single pump is configured. Alternatively, a gear pump can still be used on the second transmission shaft 2, and a variable pump can be used on the first transmission shaft 1, and logic control can be added to adjust the working state or flow of the pump on the first transmission shaft 1 according to the oil temperature of the transfer case and the driving speed of the vehicle, so that the pump does not have to work at full load all the time, less heat is generated, and energy saving is achieved. Alternatively, a variable pump can be used on the second transmission shaft 2, and a variable pump can also be used on the first transmission shaft 1, and logic control can be added to adjust the flow of the pumps on the first transmission shaft 1 and the second transmission shaft 2 according to the oil temperature of the transfer case and the driving speed of the vehicle; the two pumps do not have to work at full load all the time, less heat is generated, and energy saving is achieved. 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 present invention, when the working condition of the four-axis transfer case is good, for example, when the whole machine is mostly in a light-load state, or when the drop distance of the transfer case is not too large, the main lubrication pump 5 on the second transmission shaft 2 can fully meet the internal heat dissipation demand of the transfer case, and there is no need to start the auxiliary lubrication pump 6. However, under certain working conditions, no matter what the reason for the insufficient lubrication of the transfer case, it will inevitably cause the lubricating oil temperature of the oil pan 9 to be too high, and the excessive oil temperature will inevitably further deteriorate the lubrication system, thereby greatly increasing the risk of damage to the transfer case. For this reason, the transfer case assembly of the present application includes a controller, through which the controller logically controls the lubrication pump group, that is, the working state or speed of the lubrication pump is controlled according to the detected parameters such as oil temperature and speed, so as to realize the lubrication demand of the transfer case, ensure that the transfer case obtains sufficient lubrication, and will not cause the above-mentioned damage risk.

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

[0071] Obtaining the oil temperature value detected by the oil temperature sensor 10;

[0072] Make sure the detected oil temperature value is less than the maximum operating oil temperature T allowed for short-term operation a ;

[0073] Control vehicle start;

[0074] Make sure the detected oil temperature value is not less than the maximum operating oil temperature T allowed for short-term operation a ;

[0075] Issue an alarm and / or perform restricted operations.

[0076] It can be seen that the prerequisite for the normal start of the truck crane is that the transfer case oil temperature signal must be detected. After the 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 compared. When the detected oil temperature value is less than the maximum allowable short-term working oil temperature T a The vehicle can be started only when the detected oil temperature is not less than the maximum operating oil temperature T a When this happens, an alarm needs to be issued and / or restricted operations need to be performed.

[0077] The alarm may be in the form of voice, signal indicator light or fault code, etc. The restricted operation may include restricting the vehicle from starting, restricting the gear shifting, restricting the maximum speed of the vehicle, and restricting the continuous mileage of the vehicle before the fault is resolved.

[0078] The transfer case assembly may also be provided with a driving speed sensor 12 for collecting the driving speed of the vehicle. In this case, the controller may also be configured as follows:

[0079] Make sure the detected oil temperature is lower than the maximum continuous operating oil temperature T p ;

[0080] Control vehicle start;

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

[0082] Determine that the vehicle speed is not less than the minimum stable vehicle speed V corresponding to the lubrication requirement that can be met by the operation of the main lubrication pump 5 alone. 0 ;

[0083] Only the main lubrication pump 5 is controlled to operate.

[0084] See also Figure 3 When the oil temperature is detected, if the detected oil temperature value is not only lower than the maximum operating oil temperature T a , and is less than the maximum allowable continuous operating 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 V corresponding to the main lubrication pump 5 working to meet the lubrication needs. 0 At this time, only the main lubrication pump 5 works alone to meet the lubrication demand of the transfer case 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 as:

[0086] S100, determining that the vehicle speed is less than the minimum stable vehicle speed V corresponding to the lubrication requirement that can be met by the operation of the main lubrication pump 5 alone 0 ;

[0087] S200, control to 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 detected oil temperature value is greater than the maximum operating oil temperature T allowed for short-term operation a ;

[0089] S400, control to 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 works for the set duration, the oil temperature value is not greater than the allowed continuous minimum operating oil temperature T L ;

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

[0092] The above control logic corresponds to the case 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 detected, if only the main lubrication pump 5 needs to work alone, steps S100 and S200 can be executed at this time, that is, if the vehicle speed is less than the minimum stable vehicle speed V corresponding to the main lubrication pump 5 working alone to meet the lubrication needs 0 , which means that the input speed of the transfer case is not enough 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 there is no need to perform steps S100 and S200, that is, the vehicle speed is not less than the minimum stable vehicle speed V 0 , meet the requirements, then execute steps S300 and S400, after the main lubrication pump 5 works for the set duration, detect the oil temperature, if the detected oil temperature value is greater than the maximum working 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 steps S100 to S400 are not required, refer to Figure 3 , then execute steps S500 and S600. After only the main lubrication pump 5 works for a period of time, if it is found that the detected oil temperature value is not greater than the allowable 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 value 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 allowed 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 suitable for 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 a set duration, the detected oil temperature value is less than the maximum allowable continuous working 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 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 ;

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

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

[0105] It can be seen that the above control logic realizes the switch 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 If the oil temperature is between T p With T a If the oil temperature rises, it is not less than the maximum operating oil temperature T a When it happens, it will directly alarm, issue an alarm prompt and / or perform restrictive operations.

[0106] It should be noted that in Figure 3 The parameters in are: the 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 basic lubrication requirement of the transfer case can be met by the main lubrication pump 5 only. 0 .

[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 vehicle's related operations 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, in the present application, in a transfer case with a large drop distance or a transfer case that is often in a heavy-load condition, a lubrication pump can be added on the first transmission shaft at a higher position on the basis of the original lubrication pump. The original pump and the added pump can be a gear pump or a variable pump, and can also be combined arbitrarily according to the needs of the whole machine. In addition, logic control is added to adjust the pump displacement according to parameters such as the input speed of the transfer case, and adjust and control the work participation of the auxiliary pump to meet the lubrication needs of the transfer case 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 output speed of the transfer case of a large-tonnage truck crane is lower than the input speed. Under this condition, the vehicle speed is low, the transfer case load is greater, and the corresponding heat generation and lubrication requirements are higher, but the input speed of the transfer case is usually lower. When the original gear pump is used as the main lubrication pump, the speed of the lubrication pump will decrease synchronously, and the oil pumping capacity will decrease, thereby worsening the lubrication environment inside the transfer case. For this reason, the present application sets two or more lubrication pumps inside the transfer case, and sets one oil pump as the main oil pump and one as the auxiliary oil pump according to the capacity of the transfer case, and gives priority to the main oil pump to meet the lubrication requirements, and on this basis, try to meet the energy-saving requirements.

[0111] For transfer cases with large drop distance or products with more heavy-load conditions, adding a lubrication pump as an auxiliary pump on the first transmission shaft (the shaft at the highest position of the transfer case) can enhance the lubrication capacity and make the internal lubrication of the transfer case more sufficient. When using a variable pump, logic control can be added accordingly to adjust the flow of the pump according to the input speed of the transfer case, so that the pump does not have to work at full load all the time, generating less heat and achieving energy saving.

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

[0113] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to 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" etc. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the 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 the 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 comprises: 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 and spaced apart in the height direction; A lubrication pump group is used to pump the oil in the oil pan (9), the lubrication pump group comprising an auxiliary lubrication pump (6) installed on the first transmission shaft (1) which is the highest among the plurality of transmission shafts, and a main lubrication pump (5) installed on the other transmission shafts.

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 comprises 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 travel speed sensor (12) for collecting the travel speed of the vehicle; the transfer case assembly comprises a controller electrically connected to the main lubrication pump (5), the oil temperature sensor (10) and the travel speed sensor (12); the controller is used to adjust the displacement of the variable displacement pump according to the travel 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) 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 transfer case assembly includes a controller configured to: Acquiring 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 transfer case assembly is provided with a driving speed sensor (12) for collecting the driving speed of the vehicle, and the controller is further configured to: Determine that the detected oil temperature value is less than the maximum allowable continuous operating oil temperature T p ; Control vehicle start; Acquiring the vehicle travel speed detected by the travel speed sensor (12); Determining that the vehicle travel speed is not less than the lowest stable vehicle speed V0 corresponding to the operation of the main lubrication pump (5) alone to meet the lubrication needs; Only the main lubrication pump (5) is controlled to operate.

8. The transfer case assembly according to claim 7, characterized in that: The controller is also configured to: Determining that the vehicle travel speed is less than a minimum stable vehicle speed V0 corresponding to the operation of the main lubrication pump (5) alone to meet lubrication needs; 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 a 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 a 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.

9. The transfer case assembly according to claim 6, characterized in that: The controller is also configured to: Determine that the detected oil temperature value 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 ; Control vehicle start; The main lubrication pump (5) and the auxiliary lubrication pump (6) are controlled to work together.

10. The transfer case assembly according to claim 9, characterized in that: The controller is also 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 maximum allowable continuous working 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.

11. A truck crane, characterized in that: The truck crane comprises a transfer case assembly according to any one of claims 1 to 10.

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