Variable-volume supercharged hydraulic retarder working medium circulating system

Abstract

The utility model discloses a variable-volume supercharged hydraulic retarder working medium circulating system, and belongs to the technical field of vehicle braking. The variable-volume supercharged hydraulic retarder working medium circulating system comprises a hydraulic retarder, a working medium container, a heat exchanger and a working medium circulating pipeline, and the hydraulic retarder and the heat exchanger are arranged on the working medium circulating pipeline. The working medium container is arranged on the working medium circulating pipeline or connected with the working medium circulating pipeline through a communicating pipeline, and a variable-volume pressurizing device capable of changing the volume of a working medium in the working medium container to adjust the pressure of the working medium is arranged in the working medium container. According to the hydraulic retarder, pressurization is achieved by changing the volume of the working medium in the working medium container, it is ensured that the working medium can fully enter the working cavity of the hydraulic retarder, it can be effectively prevented that compressed air enters the working medium container, water drops are mixed into the working medium, and then the adverse effect on the braking effect is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle braking, in particular to a working medium circulation system of a variable volume boosting type hydraulic retarder. Background Art

[0002] A hydraulic retarder is a vehicle braking device, usually used to provide braking support for vehicles with large mass when decelerating or going downhill to ensure driving safety. Its working principle is to use the control medium (usually compressed air) to act on the working medium (usually oil) and press it into the working chamber of the hydraulic retarder. The high-speed operation of the rotor accelerates the working medium and restricts its flow direction so that the working medium impacts the stator blades at a reasonable angle. Through the friction between the working medium and the mutual impact between the working medium and the blades, the kinetic energy of the vehicle is converted into the heat energy of the working medium to brake the rotor, and then through the transmission between the rotor and the vehicle power output shaft, the vehicle is braked.

[0003] In order to ensure the normal operation of the hydraulic retarder, it is necessary to equip the hydraulic retarder working medium circulation system to realize the circulation of the working medium between the hydraulic retarder and the heat exchanger. The Chinese utility model patent document with the authorization announcement number CN204647073U discloses a hydraulic retarder oil circulation system, and in particular discloses a working circulation system (equivalent to the hydraulic retarder working medium circulation system), which includes a hydraulic retarder, a working medium container, a heat exchanger and a working circulation system oil circuit (i.e., a working medium circulation pipeline). The hydraulic retarder, the heat exchanger and the working medium container are arranged on the working circulation system oil circuit. When working, compressed air is added to the working medium container to make the oil enter the working chamber from the working medium container, and the rotating rotor blades accelerate the oil, and the oil is thrown onto the retarder stator along the outer extension of the rotor. The fixed stator blades have a diversion effect on the oil, so that the oil flows back to the rotor blades, which impacts the rotor, thereby generating a braking effect. The oil pressure and temperature rise rapidly under the effects of acceleration, impact, friction with the stator and rotor, as well as the internal friction of the oil itself. Subsequently, the high-temperature and high-pressure oil enters the main oil channel of the heat exchanger through the pressure control valve. At the same time, the compressed air entering the working medium container ensures that there is enough back pressure in the retarder working chamber to ensure that the oil can fully interact with the stator and rotor in the working chamber to generate sufficient torque. The oil exchanges heat with the coolant in the heat exchanger and flows back into the oil pool after the temperature drops.

[0004] However, the prior art has a significant disadvantage: water droplets are generated during the air compression process, and these water droplets enter the oil when the compressed air is filled into the working medium container, thereby affecting the braking effect. Therefore, it is necessary to improve the working medium circulation system of the hydraulic retarder. Utility Model Content

[0005] The utility model aims to provide a variable volume booster hydraulic retarder working medium circulation system, which is used to solve the problem in the prior art that compressed air entering the working medium container will bring in water droplets, resulting in reduced braking effect.

[0006] To achieve the above-mentioned purpose, the utility model discloses a variable volume boosting type hydraulic retarder working medium circulation system, which comprises a hydraulic retarder, a working medium container, a heat exchanger and a working medium circulation pipeline, wherein the hydraulic retarder and the heat exchanger are arranged on the working medium circulation pipeline, the working medium container is arranged on the working medium circulation pipeline or connected to the working medium circulation pipeline through a connecting pipeline, and a variable volume boosting device capable of changing the working medium volume in the working medium container to adjust the working medium pressure is arranged in the working medium container. When the hydraulic retarder is required to brake, the variable volume boosting device works to reduce the working medium volume in the working medium container, and in this way, the working medium is pressurized, and the pressurized working medium enters the working chamber of the hydraulic retarder through the working medium circulation pipeline, so as to ensure that the working medium can fully interact with the stator and the rotor in the working chamber and generate sufficient torque. After adopting this structure, since the compressed air will not directly enter the working medium container, no water droplets will enter the working medium, thereby avoiding affecting the braking effect.

[0007] Preferably, the variable volume boosting device comprises an air bag installed in the working medium container and capable of being connected to the inflating device. By filling the air bag with gas, the volume of the working medium in the working medium container can be reduced, thereby pressurizing the working medium. The air bag has an isolation effect on the filled gas, thereby preventing water droplets from entering the working medium.

[0008] Furthermore, the airbag is connected with an inflation tube, which is used to connect to an inflation device, and the inflation tube facilitates convenient connection with the inflation device.

[0009] Preferably, the variable volume booster device comprises a piston installed in a working medium container and capable of connecting to a power device, and the space of the working medium container located on one side of the piston is used to accommodate the working medium. By pushing or pulling the piston, the volume of the working medium in the working medium container can be reduced to achieve pressurization of the working medium, so that there is no need to fill the working medium container with compressed air, so no water droplets will enter the working medium, thereby avoiding affecting the braking effect.

[0010] Furthermore, the piston is connected to a piston rod, and the piston rod is used to connect to the power device. The piston rod is convenient for connection with the power device.

[0011] Preferably, the variable volume boosting device comprises a telescopic sleeve installed in the working medium container and capable of connecting to the power device, and an elastic sealing bag is mounted on the telescopic sleeve. The telescopic sleeve forms a skeleton with a variable volume, and the elastic sealing bag is mounted on the telescopic sleeve and has a sealing effect, and the two together form a sealed and volume-variable structure. By extending the telescopic sleeve, the volume of the working medium in the working medium container can be reduced, and the working medium can be pressurized. In this way, there is no need to fill the working medium container with compressed air, so no water droplets will enter the working medium, thereby avoiding affecting the braking effect. Compared with the piston structure, this variable volume boosting device has a better sealing effect and an easier structure to realize. Compared with the airbag structure, this variable volume boosting device is more sturdy and durable, and can achieve precise adjustment of the volume variable.

[0012] Furthermore, the telescopic sleeve comprises an inner cylinder and an outer cup, the inner cylinder is fixedly connected to the working medium container, the outer cup is sleeved on the inner cylinder, the elastic sealing bag is sleeved on the outer cup, the mouth of the elastic sealing bag extends to the part where the inner cylinder is exposed from the outer cup and is fixedly sealed and connected. The outer cup slides relative to the inner cylinder to realize the overall telescopic structure composed of the telescopic sleeve and the elastic sealing bag. The telescopic sleeve and the elastic sealing bag have a simple structure and are easy to manufacture, and the manufacturing cost is low.

[0013] Furthermore, the outer cup body is connected to the inner cylinder body in a slidable but non-rotatable manner, a driving nut is provided in the inner cavity of the telescopic sleeve, the driving nut is fixedly connected to the outer cup body, a driving screw is rotatably connected to the working medium container, the driving screw is threadedly connected to the driving nut, an electric motor is installed on the working medium container, and the power output shaft of the electric motor is dynamically connected to the driving screw. By utilizing the sliding connection between the outer cup body and the inner cylinder body and the threaded connection between the driving nut and the driving screw, the motor can make the outer cup body slide relative to the inner cylinder body when driving the driving screw to rotate, thereby realizing the telescopic sleeve. This structure can realize the accurate adjustment of the working medium volume in the working medium container to accurately control the pressurization amplitude of the working medium.

[0014] Furthermore, a long guide hole extending axially is provided on the wall of the inner cylinder, and a guide column is fixedly connected to the wall of the outer cup, and the guide column is inserted into the long guide hole. By using the cooperation between the long guide hole and the guide column, a slidable but non-rotatable connection between the outer cup and the inner cylinder is achieved. This structure is simple, reliable, and easy to manufacture and assemble.

[0015] Furthermore, the working medium container includes a tank body with an opening at one end, an end cover is installed at the opening of the tank body, the end cover closes the tank body to form a working chamber for accommodating the working medium, the end cover includes a cover plate and a cover shell fixedly connected together, a mounting chamber is formed between the cover plate and the cover shell, the inner cylinder is connected to the side of the cover plate facing the working chamber, a through hole is provided in the middle of the cover plate and a fixed sleeve extending to the mounting chamber is connected thereto, the driving screw passes through the fixed sleeve, a bearing is provided between the fixed sleeve and the driving screw, an opening is provided on the side of the cover shell away from the cover plate, the motor is installed at the opening, the power output shaft of the motor extends into the mounting chamber and is connected to the driving screw through a coupling. After adopting this structure, the working medium container and the variable volume booster device have the advantages of reliable structure, easy manufacture and convenient maintenance.

[0016] In summary, the beneficial effects of the utility model are as follows: the utility model realizes pressurization by reducing the working medium volume in the working medium container, ensuring that the working medium can fully enter the working chamber of the hydraulic retarder, and can effectively prevent water droplets from mixing into the working medium due to compressed air entering the working medium container, thereby avoiding adverse effects on the braking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model;

[0018] Figure 2 It is a structural schematic diagram of a second embodiment of the utility model;

[0019] Figure 3 It is a structural schematic diagram of a variable capacity boosting device in the third embodiment of the utility model.

[0020] In the figure: 1. hydraulic retarder, 2. working medium container, 3. heat exchanger, 4. working medium circulation pipeline, 5. connecting pipeline, 6. air bag, 7. inflation pipe, 8. piston, 9. piston rod, 10. telescopic sleeve, 11. elastic sealing bag, 101. inner cylinder, 102. outer cup body, 12. drive nut, 13. drive screw, 14. motor, 15. long guide hole, 16. guide column, 17. tank body, 18. end cover, 19. working chamber, 181. cover plate, 182. cover shell, 20. installation chamber, 21. fixing sleeve, 22. bearing, 23. coupling. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] The utility model provides a variable volume boost type hydraulic retarder working medium circulation system, aiming to solve the problem in the prior art that compressed air entering the working medium container will be mixed with water droplets, resulting in reduced braking effect.

[0023] Reference Figure 1 , Figure 2 The variable volume boosting type hydraulic retarder working medium circulation system provided by the utility model comprises a hydraulic retarder 1, a working medium container 2, a heat exchanger 3 and a working medium circulation pipeline 4, wherein the hydraulic retarder 1 and the heat exchanger 3 are arranged on the working medium circulation pipeline 4. The working medium circulation pipeline 4 is used to realize the circulation flow of the working medium (usually oil) between the hydraulic retarder 1 and the heat exchanger 3 to ensure the braking effect of the hydraulic retarder 1 and to dissipate heat to the working medium. The direction indicated by the arrow in the working medium circulation pipeline 4 shown in the figure is the flow direction of the working medium. The working medium container 2 in the illustrated embodiment is connected to the working medium circulation pipeline 4 through a connecting pipe 5; of course, the working medium container 2 can also be arranged on the working medium circulation pipeline 4. A variable volume boosting device capable of changing the working medium volume in the working medium container 2 to adjust the working medium pressure is arranged in the working medium container 2. When the hydraulic retarder 1 needs to brake, the variable volume boosting device can be started to reduce the working medium volume in the working medium container 2, so as to boost the working medium. The pressurized working medium will flow into the working chamber of the hydraulic retarder 1 through the working medium circulation pipeline 4, ensuring that the working medium can fully interact with the stator and rotor in the working chamber to generate sufficient torque. This structural design prevents compressed air from directly entering the working medium container 2, thereby preventing water droplets from entering the working medium, thereby preventing adverse effects on the braking effect.

[0024] Three embodiments of the present invention are given below.

[0025] Reference Figure 1 In the first embodiment of the utility model, the variable volume boosting device includes an airbag 6 installed in the working medium container 2, and the airbag 6 is connected to an inflation tube 7, and the inflation tube 7 is used to connect the inflation device. By using the inflation device to fill the airbag 6 with gas, the volume of the working medium in the working medium container 2 can be reduced, thereby achieving the pressure increase of the working medium.

[0026] Reference Figure 2 In the second embodiment of the utility model, the variable volume booster device includes a piston 8 installed in the working medium container 2, the space of the working medium container 2 located on one side of the piston 8 is used to accommodate the working medium, and the piston 8 is connected to a piston rod 9, which is used to connect to the power device. By using the power device to push or pull the piston 9, the volume of the working medium in the working medium container 2 can be reduced to achieve the pressurization of the working medium.

[0027] Reference Figure 3 The third embodiment of the utility model is different from the first two embodiments in that the structure of the working medium container 2 and the variable volume booster is improved. The working medium container 2 in this embodiment includes a tank body 17 with an opening at one end, and an end cover 18 is installed at the opening of the tank body 17. The end cover 18 closes the tank body 17 to form a working chamber 19 for accommodating the working medium. The end cover 18 includes a cover plate 181 and a cover shell 182 fixedly connected together, and an installation chamber 20 is formed between the cover plate 181 and the cover shell 182.

[0028] In this embodiment, the variable volume boosting device includes a telescopic sleeve 10 installed in the working medium container 2 and capable of connecting to the power device, and an elastic sealing bag 11 is mounted on the telescopic sleeve 10. Specifically, the telescopic sleeve 10 includes an inner cylinder 101 and an outer cup 102, the inner cylinder 101 is fixedly connected to the working medium container 2, the inner cylinder 101 is connected to the side of the cover plate 181 facing the working chamber 19, the outer cup 102 is mounted on the inner cylinder 101, the elastic sealing bag 11 is mounted on the outer cup 102, and the mouth of the elastic sealing bag 11 extends to the part where the inner cylinder 101 is exposed to the outer cup 102 and is fixedly sealed and connected thereto.

[0029] In this embodiment, the outer cup 102 is connected to the inner cylinder 101 in a slidable but non-rotatable manner. Specifically, the inner cylinder 101 has a long guide hole 15 extending axially on its wall, and a guide post 16 is fixedly connected to the outer cup 102 wall, and the guide post 16 is inserted into the long guide hole 15.

[0030] In this embodiment, a driving nut 12 is provided in the inner cavity of the telescopic sleeve 10, and the driving nut 12 is fixedly connected to the outer cup body 102. A through hole is provided in the middle of the cover plate 181, and a fixed sleeve 21 extending to the installation cavity 20 is connected thereto, and the driving screw 13 passes through the fixed sleeve 21, and a bearing 22 is provided between the fixed sleeve 21 and the driving screw 13. The driving screw 13 is threadedly connected to the driving nut 12.

[0031] In this embodiment, a motor 14 is installed on the working medium container 2, and the power output shaft of the motor 14 is connected to the driving screw 13. Specifically, an opening is provided on the side of the cover 182 away from the cover plate 181, and the motor 14 is installed at the opening. The power output shaft of the motor extends into the installation cavity 20 and is connected to the driving screw 13 through the coupling 23.

[0032] After the working medium circulation system of the variable volume boosting hydraulic retarder adopts the third embodiment of the utility model, by utilizing the sliding connection between the outer cup body 102 and the inner cylinder body 101 and the threaded connection between the drive nut 12 and the drive screw 13, the motor 14 can make the outer cup body 102 slide relative to the inner cylinder body 101 when driving the drive screw 13 to rotate, thereby realizing the extension and retraction of the telescopic sleeve 10. This structure can realize accurate adjustment of the working medium volume in the working medium container to accurately control the pressurization amplitude of the working medium.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A variable volume booster hydraulic retarder working medium circulation system, comprising a hydraulic retarder (1), a working medium container (2), a heat exchanger (3) and a working medium circulation pipeline (4), wherein the hydraulic retarder (1) and the heat exchanger (3) are arranged on the working medium circulation pipeline (4), and characterized in that The working medium container (2) is arranged on the working medium circulation pipeline (4) or is connected to the working medium circulation pipeline (4) through a connecting pipeline (5), and a variable volume boosting device capable of changing the working medium volume in the working medium container (2) to adjust the working medium pressure is arranged in the working medium container (2).

2. The variable volume booster hydraulic retarder working medium circulation system according to claim 1, characterized in that: The variable volume boosting device comprises an air bag (6) installed in a working medium container (2) and capable of being connected to an inflation device.

3. The variable volume booster hydraulic retarder working medium circulation system according to claim 2, characterized in that: The air bag (6) is connected to an inflation tube (7), and the inflation tube (7) is used to connect to an inflation device.

4. The variable volume booster hydraulic retarder working medium circulation system according to claim 1, characterized in that: The variable volume booster device comprises a piston (8) installed in a working medium container (2) and capable of being connected to a power device, and a space in the working medium container (2) located on one side of the piston (8) is used to accommodate the working medium.

5. The variable volume booster hydraulic retarder working medium circulation system according to claim 4, characterized in that: The piston (8) is connected to a piston rod (9), and the piston rod (9) is used to connect to a power device.

6. The variable volume booster hydraulic retarder working medium circulation system according to claim 1, characterized in that: The variable volume boosting device comprises a telescopic sleeve (10) installed in a working medium container (2) and capable of being connected to a power device, wherein an elastic sealing bag (11) is sleeved on the telescopic sleeve (10).

7. The variable volume booster hydraulic retarder working medium circulation system according to claim 6, characterized in that: The telescopic sleeve (10) comprises an inner cylinder (101) and an outer cup (102); the inner cylinder (101) is fixedly connected to a working medium container (2); the outer cup (102) is sleeved on the inner cylinder (101); an elastic sealing bag (11) is sleeved on the outer cup (102); the mouth of the elastic sealing bag (11) extends to a portion of the inner cylinder (101) where the outer cup (102) is exposed, and is fixedly and sealedly connected thereto.

8. The variable volume booster hydraulic retarder working medium circulation system according to claim 7, characterized in that: The outer cup body (102) is connected to the inner cylinder body (101) in a slidable but non-rotatable manner; a driving nut (12) is provided in the inner cavity of the telescopic sleeve (10); the driving nut (12) is fixedly connected to the outer cup body (102); a driving screw (13) is rotatably connected to the working medium container (2); the driving screw (13) is threadedly connected to the driving nut (12); an electric motor (14) is installed on the working medium container (2); and a power output shaft of the electric motor (14) is power-connected to the driving screw (13).

9. The variable volume booster hydraulic retarder working medium circulation system according to claim 8, characterized in that: The inner cylinder (101) is provided with an axially extending long guide hole (15) on its wall, and a guide column (16) is fixedly connected to the outer cup (102) wall, the guide column (16) being inserted into the long guide hole (15).

10. The variable volume booster hydraulic retarder working medium circulation system according to claim 8, characterized in that: The working medium container (2) comprises a tank body (17) with an opening at one end, an end cover (18) being installed at the opening of the tank body (17), the end cover (18) sealing the tank body (17) to form a working chamber (19) for containing the working medium, the end cover (18) comprising a cover plate (181) and a cover shell (182) fixedly connected together, an installation chamber (20) being formed between the cover plate (181) and the cover shell (182), and the inner cylinder (101) being connected to a side of the cover plate (181) facing the working chamber (19). A through hole is provided in the middle of the cover plate (181) and a fixed sleeve (21) extending toward the mounting cavity (20) is connected to the through hole. The driving screw (13) passes through the fixed sleeve (21). A bearing (22) is provided between the fixed sleeve (21) and the driving screw (13). An opening is provided on a side of the cover (182) away from the cover plate (181). The motor (14) is installed at the opening. The power output shaft of the motor extends into the mounting cavity (20) and is connected to the driving screw (13) through a coupling (23).

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