Novel cold chain transport vehicle

Abstract

The utility model discloses a novel cold chain transport vehicle. The novel cold chain transport vehicle comprises an engine, a clutch structure, a station switching control module, a multi-station gearbox, a transfer case, a hydraulic recovery module, a hydraulic generator module and a refrigeration module. An output shaft of the engine is connected with an input shaft of the multi-station gearbox through a clutch structure; an output shaft of the multi-station gearbox is respectively connected with a front wheel transmission shaft and a rear wheel transmission shaft through a transfer case; a power take-off shaft of the multi-station gearbox is connected with the input end of the hydraulic generator module through the hydraulic recovery module; the output end of the hydraulic generator module is connected with the refrigeration module; the station switching control module is used for connecting an output shaft of the multi-station gearbox with a power take-off shaft of the multi-station gearbox in a first state; and the connecting device is used for connecting the input shaft of the multi-station gearbox with the power take-off shaft of the multi-station gearbox in the second state. According to the scheme, the design of the low-cost and energy-saving cold chain transport vehicle is realized.

Description

Technical Field

[0001] This utility model relates to the field of transport vehicle technology, and in particular to a novel cold chain transport vehicle. Background Technology

[0002] Refrigerated and frozen goods are kept at a specified low temperature throughout all stages of production, storage, transportation, sales, and consumption to ensure their quality and performance. This system, established with advancements in science and technology and the development of refrigeration technology, is a low-temperature logistics and transportation process based on cryogenics and utilizing refrigeration technology.

[0003] Currently, all existing refrigerated trucks are equipped with two engines: one for refrigeration and one for driving. These engines drive the vehicle's driving system and the other for the refrigeration system of the refrigerated container. Specifically, the driving engine, controlled by a clutch, drives the gearbox, which in turn shifts gears and adjusts the vehicle's speed. This gearbox then drives the transfer case, which has two output power take-off ports that drive the front and rear drive shafts respectively. These two drive shafts then drive the front and rear wheels, thus propelling the vehicle. The second engine in the refrigerated container drives a generator to generate electricity, which, through a well-configured electronic control system, provides a stable and sufficient power supply to the refrigeration system of the refrigerated container. Existing refrigerated trucks rely on friction between friction plates and wheels for braking. Due to the large inertia and long braking distance of refrigerated transport vehicles, braking energy consumption is high, resulting in significant energy loss during long-distance transport. The existing configuration of cold chain vehicles will cause the following problems: (1) The use of two engines increases the vehicle manufacturing cost; (2) When the cold chain vehicle brakes, it uses mechanical friction to consume the kinetic energy of the vehicle, and all the energy is wasted, which increases the logistics cost; or a large amount of energy wasted requires more energy to replenish, which will aggravate environmental pollution and damage; or the existing cold chain vehicle generates heat from friction, and a large amount of heat will accelerate the wear and aging of components, and excessive heat will burn out the friction components. Utility Model Content

[0004] This utility model provides a novel cold chain transport vehicle to achieve a low-cost, energy-saving design, avoiding problems such as high vehicle manufacturing costs, energy waste, and burnout of friction components.

[0005] To achieve the above objectives, this utility model provides a novel cold chain transport vehicle, which includes: an engine, a clutch structure, a workstation switching control module, a multi-workstation gearbox, a transfer case, a hydraulic recovery module, a hydraulic generator module, and a refrigeration module.

[0006] The output shaft of the engine is connected to the input shaft of the multi-station gearbox via the clutch structure; the output shaft of the multi-station gearbox is connected to the front wheel drive shaft and the rear wheel drive shaft respectively via the transfer case; the power take-off shaft of the multi-station gearbox is connected to the input end of the hydraulic generator module via the hydraulic recovery module; the output end of the hydraulic generator module is connected to the refrigeration module.

[0007] The workstation switching control module is used to connect the output shaft of the multi-station gearbox to the power take-off shaft of the multi-station gearbox in the first state; and to connect the input shaft of the multi-station gearbox to the power take-off shaft of the multi-station gearbox in the second state.

[0008] Optionally, the workstation switching control module is further configured to disconnect the input shaft and output shaft of the multi-station gearbox from the power take-off shaft of the multi-station gearbox in the third state.

[0009] Optionally, the hydraulic recovery module includes: a brake hydraulic pump, a high-pressure oil circuit, a low-pressure oil circuit, a hydraulic energy recovery unit, and a low-pressure oil storage unit;

[0010] The input shaft of the brake hydraulic pump is connected to the power take-off shaft of the multi-position gearbox; the oil outlet of the brake hydraulic pump is connected to the oil inlet of the hydraulic generator module through the high-pressure oil circuit; the oil inlet of the brake hydraulic pump is connected to the oil outlet of the hydraulic generator module through the low-pressure oil circuit.

[0011] The hydraulic energy recovery unit is installed on the high-pressure oil circuit;

[0012] The low-pressure oil storage unit is installed on the low-pressure oil line.

[0013] Optionally, the workstation switching control module includes a function switching valve;

[0014] The input end of the function switching valve is connected to the outlet of the low-pressure oil storage unit through the first oil circuit; the first output end of the function switching valve is connected to the first control end of the linkage rod in the multi-station gearbox through the second oil circuit.

[0015] The second output end of the function switching valve is connected to the second control end of the linkage rod in the multi-position gearbox via a third oil circuit.

[0016] One end of the connecting rod in the multi-station gearbox is connected to the power take-off shaft of the multi-station gearbox; the other end of the connecting rod in the multi-station gearbox is suspended in the air.

[0017] Optionally, the hydraulic recovery module further includes: an energy storage switch valve and an energy storage pressure regulating valve;

[0018] The energy storage switch valve is installed on the high-pressure oil circuit. The energy storage switch valve is normally closed. The energy storage switch valve includes two oppositely arranged first pilot end and second pilot end. The first pilot end is located at the same end as the spring of the energy storage switch valve. The second pilot end is connected to the oil inlet of the energy storage switch valve.

[0019] The energy storage pressure regulating valve has an adjustable opening oil pressure and is normally closed. The energy storage pressure regulating valve includes a first pilot control terminal and a second pilot control terminal located at both ends of the valve core and not connected to each other. The first pilot control terminal is connected to the oil inlet of the energy storage switch valve, the oil inlet of the energy storage pressure regulating valve is connected to the second pilot control terminal, and the oil outlet of the energy storage pressure regulating valve is connected to the low-pressure oil storage unit.

[0020] Optionally, the hydraulic recovery module further includes: a pressure regulating valve and a throttle valve;

[0021] The outlet of the energy storage switch valve is connected to the oil inlet of the hydraulic generator module in sequence through the pressure regulating valve and the throttle valve.

[0022] Optionally, the hydraulic recovery module further includes: a braking torque limiting valve;

[0023] The high-pressure oil circuit is connected to the low-pressure oil circuit through the braking torque limiting valve.

[0024] Optionally, the hydraulic recovery module further includes: an unloading valve;

[0025] The unloading valve is located between the oil outlet and the oil inlet of the brake hydraulic pump.

[0026] Optionally, the transport vehicle also includes a safety relief valve;

[0027] The oil inlet of the hydraulic generator module is connected to the inlet of the low-pressure oil storage unit through the safety relief valve.

[0028] Optionally, the transport vehicle may also include: a check valve;

[0029] The oil inlet of the hydraulic generator module is connected to the inlet of the low-pressure oil storage unit through the check valve.

[0030] In this embodiment of the invention, a workstation switching control module controls a multi-station gearbox to operate in different workstation states. When the workstation switching control module is in the first state, it connects the output shaft of the multi-station gearbox to its power take-off shaft. The power take-off shaft of the multi-station gearbox is connected to the input end of a hydraulic generator module via a hydraulic recovery module. The output end of the hydraulic generator module is connected to the refrigeration module. Thus, during braking, the front and rear wheel drive shafts drive the transfer case, which in turn drives the gearbox, thereby driving the hydraulic recovery module to stop the wheels from moving forward. At the same time, the hydraulic recovery module converts the vehicle's braking kinetic energy into hydraulic energy for recovery. Under certain conditions, the hydraulic energy is automatically released and used to drive the hydraulic generator module to generate electricity, thereby providing power to the refrigeration module. In this way, this solution achieves both refrigeration and vehicle operation using a single generator, thus reducing the cost of cold chain transport vehicles. Furthermore, the braking energy is recovered and reused by the refrigeration module, saving energy and reducing heat generation. Attached Figure Description

[0031] Figure 1 This is a structural schematic diagram of a novel cold chain transport vehicle provided in an embodiment of this utility model;

[0032] Figure 2 This is a schematic diagram of the specific structure of a novel cold chain transport vehicle provided in this embodiment of the utility model;

[0033] Figure 3 This is a schematic diagram of the specific structure of another novel cold chain transport vehicle provided in this embodiment of the utility model;

[0034] Figure 4 This is a schematic diagram of the specific structure of another novel cold chain transport vehicle provided in this embodiment of the utility model.

[0035] Figure 5 This is a schematic diagram of the specific structure of an energy storage switch valve and an energy storage pressure regulating valve provided in this embodiment of the utility model. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0037] Figure 1 This is a structural schematic diagram of a novel cold chain transport vehicle provided by an embodiment of this utility model; as shown... Figure 1As shown, the transport vehicle includes: an engine 10, a clutch structure 20, a workstation switching control module 30, a multi-workstation gearbox 40, a transfer case 50, a hydraulic recovery module 60, a hydraulic generator module 70, and a refrigeration module 80.

[0038] The output shaft of engine 10 is connected to the input shaft A of multi-station gearbox 40 via clutch structure 20; the output shaft B of multi-station gearbox 40 is connected to the front wheel drive shaft and the rear wheel drive shaft respectively via transfer case 50; the power take-off shaft C of multi-station gearbox 40 is connected to the input end of hydraulic generator module 70 via hydraulic recovery module 60; the output end of hydraulic generator module 70 is connected to cooling module 80.

[0039] The workstation switching control module 30 is used to connect the output shaft B of the multi-station gearbox 40 to the power take-off shaft C of the multi-station gearbox 40 in the first state; and to connect the input shaft A of the multi-station gearbox 40 to the power take-off shaft C of the multi-station gearbox 40 in the second state.

[0040] Among them, the multi-station gearbox 40 is a gearbox that can switch between different workstation states while realizing the basic gear shifting function; the different workstation states of the multi-station gearbox 40 can be switched by the workstation switching control module 30; the workstation switching control module 30 can be a hydraulic design structure or an electrical control structure, and this embodiment does not make a specific limitation on it;

[0041] Hydraulic recovery module 60 is a hydraulic transmission component that converts external kinetic energy into hydraulic energy for recovery; hydraulic generator module 70 is a hydraulic generator component that converts hydraulic energy into electrical energy.

[0042] In this embodiment, the workstation switching control module 30 controls the multi-station gearbox 40 to be in different workstation states. When the workstation switching control module 30 is in the first state, it connects the output shaft B of the multi-station gearbox 40 to the power take-off shaft C of the multi-station gearbox 40. The power take-off shaft C of the multi-station gearbox 40 is connected to the input end of the hydraulic generator module 70 through the hydraulic recovery module 60. The output end of the hydraulic generator module 70 is connected to the cooling module 80. That is, when the workstation switching control module 30 is in the first state, the transfer case 50 is connected to the hydraulic recovery module 60 through the multi-station gearbox 40. Thus, during braking, the engine 10 is connected to the clutch structure 20, the input shaft A of the multi-station gearbox 40, and the output shaft of the multi-station gearbox 40. Axle B and transfer case 50 stop driving the front and rear wheel drive shafts; when the front and rear wheel drive shafts are driven by braking inertia, the transfer case 50 drives the multi-position gearbox 40, which in turn drives the hydraulic recovery module 60, stopping the wheels from moving forward; at the same time, the hydraulic recovery module 60 converts the vehicle's braking kinetic energy into hydraulic energy recovery, and automatically releases the hydraulic energy under certain conditions. This hydraulic energy is used to drive the hydraulic generator module 70 to generate electricity, thereby providing power to the refrigeration module 80; in this way, this solution uses a single generator 10 to achieve both refrigeration and driving functions, thus realizing a low-cost design for the cold chain transport vehicle; at the same time, the braking energy is recovered and reused by the refrigeration module 80, saving energy, improving energy utilization, and reducing heat generation;

[0043] When the workstation switching control module 30 is in the second state, it connects the input shaft A of the multi-station gearbox 40 to the power take-off shaft C of the multi-station gearbox 40. The power take-off shaft C of the multi-station gearbox 40 is connected to the input end of the hydraulic generator module 70 through the hydraulic recovery module 60. The output end of the hydraulic generator module 70 is connected to the cooling module 80. That is, when the workstation switching control module 30 is in the second state, the generator 10 is connected to the hydraulic recovery module 60 through the clutch structure 20 and the multi-station gearbox 40. In this way, when the hydraulic energy recovered by the hydraulic recovery module 70 during braking is insufficient to drive the hydraulic generator module 70 to generate electricity, during normal vehicle operation, the generator 10 can still drive the hydraulic recovery module 60 to work through the clutch structure 20 and the multi-station gearbox 40. The hydraulic recovery module 60 converts the engine mechanical energy into hydraulic energy, thereby driving the hydraulic generator module 70 to generate electricity, thus providing power to the cooling module 80. In this way, this solution realizes the hydraulic recovery mode of the hydraulic recovery module 70 under different conditions through the multi-station gearbox 40.

[0044] Optionally, the workstation switching control module 30 is also used to disconnect the input shaft A or output shaft B of the multi-station gearbox 40 from the power take-off shaft C of the multi-station gearbox in the third state. Specifically, in some scenarios without cooling requirements, the engine 10 does not need to be connected to the hydraulic recovery module 60; simultaneously, the transfer case 50 also does not need to be connected to the hydraulic recovery module 60. Thus, the hydraulic recovery module 60 cannot recover hydraulic energy, and therefore cannot drive the hydraulic generator module 70 to generate electricity.

[0045] Optionally, based on the above embodiments, the hydraulic recovery module 60 can be further refined. Figure 2 This is a schematic diagram of the specific structure of a novel cold chain transport vehicle provided in an embodiment of this utility model; as shown below. Figure 2 As shown, the hydraulic recovery module 60 includes: a brake hydraulic pump 61, a high-pressure oil circuit 62, a low-pressure oil circuit 63, a hydraulic energy recovery unit 64, and a low-pressure oil storage unit 65.

[0046] The input shaft of the brake hydraulic pump 61 is connected to the power take-off shaft C of the multi-position gearbox 40; the oil outlet of the brake hydraulic pump 61 is connected to the oil inlet of the hydraulic generator module 70 through the high-pressure oil circuit 62; the oil inlet of the brake hydraulic pump 61 is connected to the oil outlet of the hydraulic generator module 70 through the low-pressure oil circuit 63; the hydraulic energy recovery unit 64 is installed on the high-pressure oil circuit 62; and the low-pressure oil storage unit 65 is installed on the low-pressure oil circuit 63.

[0047] Among them, the brake hydraulic pump 61 is a pilot-controlled electro-proportional pump; the electro-proportional pilot-controlled pump operates continuously under the drive and control of external force and completes the oil suction and discharge process; the oil discharge volume of the electro-proportional pilot-controlled pump is adjustable; the oil discharge volume of the electro-proportional pilot-controlled pump is proportional to the travel of the brake pedal, that is, the greater the travel of the brake pedal, the greater the oil discharge volume of the electro-proportional pilot-controlled pump, and the more hydraulic energy is recovered by the hydraulic recovery module 60; at the same time, the greater the counter-braking force generated; when the oil discharge volume of the electro-proportional pilot-controlled pump is constant, the greater the engine speed or wheel speed, the more hydraulic energy is recovered by the hydraulic recovery module 60.

[0048] Specifically, the hydraulic recovery principle of the hydraulic recovery module 60 is as follows: When braking the vehicle, the wheel drive shaft is connected to the input shaft of the brake hydraulic pump 61 through the transfer case 50 and the multi-position gearbox 40. The brake hydraulic pump 61 is driven to rotate by the wheel drive shaft. The hydraulic oil in the low-pressure oil circuit 63 enters the high-pressure oil circuit 62 through the brake hydraulic pump 61, converting the kinetic energy of the vehicle braking into hydraulic energy to achieve vehicle braking. The hydraulic oil in the high-pressure oil circuit 62 enters the hydraulic generator module 70, converting the hydraulic energy into electrical energy for storage, realizing energy recovery during the vehicle braking process, and driving the hydraulic generator module 70 to generate electricity. The hydraulic oil coming out of the hydraulic generator module 70 then enters the low-pressure oil circuit 63 again, realizing the recycling of hydraulic oil, which is energy-saving and environmentally friendly.

[0049] Alternatively, during normal vehicle operation, the output shaft of engine 10 is connected to the input shaft of brake hydraulic pump 61 via clutch structure 20 and multi-position gearbox 40. Brake hydraulic pump 61 is driven to rotate by the engine. Hydraulic oil in low-pressure oil circuit 63 enters high-pressure oil circuit 62 through brake hydraulic pump 61, converting the mechanical energy output by engine 10 into hydraulic energy. Hydraulic oil in high-pressure oil circuit 62 enters hydraulic generator module 70, converting hydraulic energy into electrical energy to drive refrigeration module 80. Hydraulic oil exiting hydraulic generator module 70 then re-enters low-pressure oil circuit 63, achieving hydraulic oil recycling, which is energy-saving and environmentally friendly.

[0050] Optionally, the workstation switching control module 30 can be further refined. Figure 3 This is a schematic diagram of the specific structure of another novel cold chain transport vehicle provided in this embodiment of the utility model; as shown. Figure 3 As shown, the workstation switching control module 30 includes a function switching valve 31; the input end of the function switching valve 31 is connected to the outlet of the low-pressure oil storage unit 65 through a first oil circuit; the first output end of the function switching valve 31 is connected to the first control end of the linkage L in the multi-station gearbox 40 through a second oil circuit; the second output end of the function switching valve 31 is connected to the second control end of the linkage L in the multi-station gearbox 40 through a third oil circuit; one end of the linkage L in the multi-station gearbox 40 is connected to the power take-off shaft C of the multi-station gearbox 40; the other end of the linkage L in the multi-station gearbox 40 is suspended.

[0051] In this embodiment, the workstation switching control module 30 employs a function switching valve 31. The function switching valve 31 utilizes the hydraulic switching principle to switch between various workstation states of the multi-station gearbox. Specifically, when the workstation switching control module 30 is in the first state, the upper solenoid valve of the corresponding function switching valve 31 is energized, and the oil circuit of the low-pressure oil storage unit 65 passes through the upper valve of the function switching valve 31 and drives the first control end of the linkage L through the first oil circuit, thereby connecting the output shaft B of the multi-station gearbox 40 with the power take-off shaft C of the multi-station gearbox. When the workstation switching control module 30 is in the second state, the lower solenoid valve of the corresponding function switching valve 31 is energized, and the oil circuit of the low-pressure oil storage unit 65 passes through the lower valve of the function switching valve 31 and drives the second control end of the linkage L through the second oil circuit, thereby connecting the power take-off shaft C of the multi-station gearbox with the input shaft A of the multi-station gearbox.

[0052] Optionally, based on the above embodiments, the hydraulic recovery module 60 can be further optimized. Figure 4 This is a schematic diagram of the specific structure of a novel cold chain transport vehicle provided in this embodiment of the utility model; Figure 5This is a schematic diagram of the specific structure of an energy storage switching valve and an energy storage pressure regulating valve provided in an embodiment of this utility model; as shown... Figure 4-5 As shown, the hydraulic recovery module 60 also includes: an energy storage switch valve 66 and an energy storage pressure regulating valve 67;

[0053] The energy storage switch valve 66 is installed on the high-pressure oil circuit 62. The energy storage switch valve 66 is normally closed. The energy storage switch valve 66 includes two oppositely arranged first pilot end 661 and second pilot end 662. The first pilot end 661 is located at the same end as the spring 663 of the energy storage switch valve 66, and the second pilot end 662 is connected to the oil inlet of the energy storage switch valve 66.

[0054] The energy storage pressure regulating valve 67 has an adjustable opening oil pressure and is normally closed. The energy storage pressure regulating valve 67 includes a first pilot control terminal 671 and a second pilot control terminal 672 located at both ends of the valve core and not connected to each other. The first pilot control terminal 671 is connected to the oil inlet of the energy storage switch valve 66, the oil inlet of the energy storage pressure regulating valve 67 is connected to the second pilot control terminal 672, and the oil outlet of the energy storage pressure regulating valve 67 is connected to the low-pressure oil storage unit 65.

[0055] Specifically, as the oil pressure in the high-pressure oil circuit 62 gradually increases, the oil pressure at the first pilot control terminal 671 gradually increases until it reaches the set value. The energy storage pressure regulating valve 67 will open under the combined action of the oil pressure at the first pilot control terminal 671, the oil pressure at the second pilot control terminal 672, and its own spring. This will connect the first pilot terminal 661 of the energy storage switch valve 66 to the hydraulic oil storage unit 65 through the energy storage pressure regulating valve 67, thus relieving pressure on the first pilot terminal 661 of the energy storage switch valve 66. The energy storage switch valve 66 will then open under the combined action of its own spring force and the pressure provided by the oil pressure at the second pilot terminal 662, thereby supplying the hydraulic oil in the high-pressure oil circuit 62 to the hydraulic generator module 70. By adjusting the opening and closing oil pressure of the energy storage pressure regulating valve 67, not only can the energy storage switch valve 66 be automatically opened at the set opening pressure and automatically closed at the set closing pressure, but the hydraulic oil flow requirements during hydraulic braking can also be met. In this way, the energy storage switch valve 66 and the energy storage pressure regulating valve 67 are used to prevent the hydraulic generator module 70 from frequently opening due to short-term braking.

[0056] When the pressure provided by the oil pressure at the first pilot control terminal 671 is less than the force provided by the spring of the energy storage pressure regulating valve 67, the energy storage pressure regulating valve 67 will reset and close. During the reset process of the energy storage pressure regulating valve 67, the hydraulic oil at the second pilot control terminal 672 will build up pressure in the first pilot terminal 661. Since the oil outlet of the energy storage pressure regulating valve 67 is connected to the hydraulic oil storage unit 65, after the energy storage pressure regulating valve 67 closes, as the oil pressure at the first pilot terminal 661 of the energy storage switch valve 66 gradually increases, the energy storage switch valve 66 will automatically close under the action of its own spring, so as to realize that the opening oil pressure of the energy storage switch valve is greater than the reset oil pressure of the energy storage switch valve 66, so as to make full use of the hydraulic oil in the hydraulic energy recovery unit 64.

[0057] It should be noted that the energy storage switch valve 66 and the energy storage pressure regulating valve 67 can be selected from existing integrated valve structures, or two separate valves connected by pipelines can be used, depending on the actual safety requirements, which will not be elaborated here. In other embodiments, when a single hydraulically controlled pressure regulating valve with adjustable opening and reset pressure can meet the requirements for flow rate, pressure, etc., a single hydraulically controlled pressure regulating valve with adjustable opening and reset pressure can be used to replace the aforementioned energy storage switch valve 66 and energy storage pressure regulating valve 67.

[0058] Optional, continue to refer to Figure 4 The hydraulic recovery module 60 also includes a pressure regulating valve 68 and a throttle valve 69. The outlet of the energy storage switch valve 66 is connected to the oil inlet of the hydraulic generator module 70 via the pressure regulating valve 68 and the throttle valve 69. The pressure regulating valve 68 automatically adjusts the pressure difference across the throttle valve 69, and the throttle valve 69 regulates the flow rate in the high-pressure oil circuit 62 to maintain a constant flow, thereby providing a stable and reliable hydraulic oil supply to the hydraulic generator module 70 and ensuring the stability of the hydraulic generator module 70 during power generation.

[0059] Optional, continue to refer to Figure 4 The hydraulic recovery module 60 also includes a braking torque limiting valve 691; the high-pressure oil circuit 62 is connected to the low-pressure oil circuit 63 through the braking torque limiting valve 691. The braking torque limiting valve 691 is used to limit the maximum braking torque during braking. When the oil pressure in the high-pressure oil circuit 62 is too high, the braking torque limiting valve 691 opens, connecting the high-pressure oil circuit 62 and the low-pressure oil circuit 63 to provide high-pressure protection for the high-pressure oil circuit 62.

[0060] Optional, continue to refer to Figure 4 The hydraulic recovery module 60 also includes an unloading valve 692; the unloading valve 692 is disposed between the oil outlet and the oil inlet of the brake hydraulic pump 61. In this embodiment, when the unloading valve 692 is open, the two oil ports of the brake hydraulic pump 61 are connected, thereby relieving pressure on the brake hydraulic pump 61.

[0061] Optional, continue to refer to Figure 4 The transport vehicle also includes a safety relief valve 90; the oil inlet of the hydraulic generator module 70 is connected to the inlet of the low-pressure oil storage unit 65 via the safety relief valve 90. The maximum operating oil pressure of the hydraulic generator module 70 is limited by the safety relief valve 90.

[0062] Optional, continue to refer to Figure 4 The transport vehicle also includes: a check valve 100; the oil inlet of the hydraulic generator module 70 is connected to the inlet of the low-pressure oil storage unit 65 through the check valve 100. The check valve 100 replenishes oil to the hydraulic generator module 70, preventing it from drawing in cavitation and thus protecting it.

[0063] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A novel cold chain transport vehicle, characterized in that, include: Engine, clutch structure, workstation switching control module, multi-station gearbox, transfer case, hydraulic recovery module, hydraulic generator module and refrigeration module; The output shaft of the engine is connected to the input shaft of the multi-station gearbox via the clutch structure; the output shaft of the multi-station gearbox is connected to the front wheel drive shaft and the rear wheel drive shaft respectively via the transfer case; the power take-off shaft of the multi-station gearbox is connected to the input end of the hydraulic generator module via the hydraulic recovery module; the output end of the hydraulic generator module is connected to the refrigeration module. The workstation switching control module is used to connect the output shaft of the multi-station gearbox to the power take-off shaft of the multi-station gearbox in the first state. Used to connect the input shaft of the multi-station gearbox to the power take-off shaft of the multi-station gearbox in the second state.

2. The novel cold chain transport vehicle according to claim 1, characterized in that, The workstation switching control module is also used to disconnect the input shaft and output shaft of the multi-station gearbox from the power take-off shaft of the multi-station gearbox in the third state.

3. The novel cold chain transport vehicle according to claim 1, characterized in that, The hydraulic recovery module includes: a brake hydraulic pump, a high-pressure oil circuit, a low-pressure oil circuit, a hydraulic energy recovery unit, and a low-pressure oil storage unit; The input shaft of the brake hydraulic pump is connected to the power take-off shaft of the multi-position gearbox; the oil outlet of the brake hydraulic pump is connected to the oil inlet of the hydraulic generator module through the high-pressure oil circuit; the oil inlet of the brake hydraulic pump is connected to the oil outlet of the hydraulic generator module through the low-pressure oil circuit. The hydraulic energy recovery unit is installed on the high-pressure oil circuit; The low-pressure oil storage unit is installed on the low-pressure oil line.

4. The novel cold chain transport vehicle according to claim 3, characterized in that, The workstation switching control module includes a function switching valve; The input end of the function switching valve is connected to the outlet of the low-pressure oil storage unit through the first oil circuit; the first output end of the function switching valve is connected to the first control end of the linkage rod in the multi-station gearbox through the second oil circuit. The second output end of the function switching valve is connected to the second control end of the linkage rod in the multi-position gearbox via a third oil circuit. One end of the connecting rod in the multi-station gearbox is connected to the power take-off shaft of the multi-station gearbox; the other end of the connecting rod in the multi-station gearbox is suspended in the air.

5. The novel cold chain transport vehicle according to claim 3, characterized in that, The hydraulic recovery module also includes: an energy storage switch valve and an energy storage pressure regulating valve; The energy storage switch valve is installed on the high-pressure oil circuit. The energy storage switch valve is normally closed. The energy storage switch valve includes two oppositely arranged first pilot end and second pilot end. The first pilot end is located at the same end as the spring of the energy storage switch valve. The second pilot end is connected to the oil inlet of the energy storage switch valve. The energy storage pressure regulating valve has an adjustable opening oil pressure and is normally closed. The energy storage pressure regulating valve includes a first pilot control terminal and a second pilot control terminal located at both ends of the valve core and not connected to each other. The first pilot control terminal is connected to the oil inlet of the energy storage switch valve, the oil inlet of the energy storage pressure regulating valve is connected to the second pilot control terminal, and the oil outlet of the energy storage pressure regulating valve is connected to the low-pressure oil storage unit.

6. The novel cold chain transport vehicle according to claim 5, characterized in that, The hydraulic recovery module also includes: a pressure regulating valve and a throttle valve; The outlet of the energy storage switch valve is connected to the oil inlet of the hydraulic generator module in sequence through the pressure regulating valve and the throttle valve.

7. The novel cold chain transport vehicle according to claim 6, characterized in that, The hydraulic recovery module also includes: a braking torque limiting valve; The high-pressure oil circuit is connected to the low-pressure oil circuit through the braking torque limiting valve.

8. The novel cold chain transport vehicle according to claim 3, characterized in that, The hydraulic recovery module also includes: an unloading valve; The unloading valve is located between the oil outlet and the oil inlet of the brake hydraulic pump.

9. The novel cold chain transport vehicle according to claim 3, characterized in that, It also includes a safety relief valve; The oil inlet of the hydraulic generator module is connected to the inlet of the low-pressure oil storage unit through the safety relief valve.

10. The novel cold chain transport vehicle according to claim 3, characterized in that, Also includes: Check valve; The oil inlet of the hydraulic generator module is connected to the inlet of the low-pressure oil storage unit through the check valve.

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