Retarder unloading system controlled by electric pump and solenoid valve

Abstract

The present invention provides a retarder unloading system controlled by an electric pump and a solenoid valve, and relates to the technical field of vehicle retarders. The retarder unloading system includes a retarder mechanical device, an unloading valve and an electric pump; the retarder mechanical device has a high-pressure chamber and a low-pressure chamber; the unloading valve has a piston loading chamber, the piston loading chamber has a high-pressure port, a low-pressure port and a control port, the high-pressure port is connected to the high-pressure chamber through a high-pressure branch, and the low-pressure port is connected to the low-pressure chamber; the electric pump is connected to the control port through a first pipeline, and the electric pump can decompress the piston loading chamber. In the decompression state, the unloading valve is in an open state, and the high-pressure port is connected to the low-pressure port. Not only does it alleviate the technical problem of the relatively slow unloading reaction speed of the retarder existing in the prior art, but it also achieves the technical effects of rapid unloading reaction and precise control, and the volumetric pump principle can be used for the retarder.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle retarders, and in particular to a retarder unloading system controlled by an electric pump and a solenoid valve. Background Art

[0002] Due to the large number of intersections on urban roads, dense bus stops and heavy passenger flow, buses often have to brake frequently; mountain roads are steep and have many sharp turns, and medium and large trucks and buses that travel on mountain roads for a long time also often need to brake.

[0003] When the brakes are used frequently for a long time, the brake shoes will wear out quickly, the service life of the brake friction pads will be shortened, and the braking force will be lost or the braking performance will be greatly reduced due to the thermal decay of the brakes, which has become one of the main causes of traffic accidents. Therefore, it is very necessary to equip the auxiliary braking system.

[0004] As an auxiliary braking component of the vehicle, the retarder reduces the load on the original vehicle's braking system by acting on the original vehicle's transmission system, allowing the vehicle to decelerate evenly, thereby improving the reliability of the vehicle's braking system, extending the service life of the braking system, and significantly reducing the vehicle's operating costs.

[0005] At present, the retarders mainly include engine retarders, eddy current retarders and hydraulic retarders, etc. Among them, the eddy current retarder has the disadvantages of large size, heavy body and high power consumption; the hydraulic retarder has at least the disadvantages of large volume, relatively slow reaction speed, insufficient low-speed braking force, large no-load loss, etc. Moreover, the current hydraulic retarders all adopt the principle of stator-rotor mixed flow pump, which can enable the positive displacement pump to unload when it is no-load, resulting in very small no-load resistance, so the positive displacement pump principle can be applied to the retarder. Summary of the invention

[0006] The object of the present invention is to provide a retarder unloading system controlled by an electric pump and a solenoid valve, so as to alleviate the technical problem of relatively slow unloading reaction speed of the retarder existing in the prior art.

[0007] The present invention provides a retarder unloading system controlled by an electric pump and a solenoid valve, comprising: a retarder mechanical device, an unloading valve and an electric pump;

[0008] The deceleration mechanical device has a high-pressure chamber and a low-pressure chamber;

[0009] The unloading valve has a piston loading chamber, the piston loading chamber has a high pressure port, a low pressure port and a control port, the high pressure port is connected to the high pressure chamber through a high pressure branch, and the low pressure port is connected to the low pressure chamber;

[0010] The electric pump is connected to the control port through a first pipeline, and the electric pump can decompress the piston loading chamber. In the decompression state, the unloading valve is in an open state, and the high-pressure port is connected to the low-pressure port.

[0011] Furthermore, the electric pump is connected to a reversing valve via a second pipeline;

[0012] The reversing valve is connected to the oil storage expansion chamber through a first reversing branch.

[0013] Furthermore, the reversing valve is connected to the high-pressure branch via a second reversing branch;

[0014] The electric pump is connected to the oil storage expansion chamber through the third pipeline, and can draw the working medium in the high-pressure chamber and the low-pressure chamber back to the oil storage expansion chamber through the second reversing branch, the reversing valve, the electric pump and the third pipeline.

[0015] Furthermore, a first solenoid valve is provided on the third pipeline. When the power is off, the first solenoid valve connects the electric pump with the oil storage expansion chamber and connects the high-pressure chamber to the atmosphere.

[0016] Furthermore, the first solenoid valve is a two-position three-way valve.

[0017] Further, it also includes an air branch;

[0018] One end of the air branch is connected to the first solenoid valve, and the other end is connected to the high-pressure branch;

[0019] When the first solenoid valve is in a power-off state, the high-pressure chamber is connected to the atmosphere through the air branch.

[0020] Furthermore, a second solenoid valve is provided on the air branch;

[0021] The second solenoid valve has two connecting outlets, one of which is connected to the high-pressure branch, and the other is used to connect to other branches.

[0022] Furthermore, the unloading valve is provided in plurality, and the plurality of unloading valves are provided in parallel.

[0023] Furthermore, the electric pump is installed on the housing of the retarding mechanical device.

[0024] Beneficial effects:

[0025] The retarder unloading system provided by the present invention is controlled by an electric pump and a solenoid valve. The electric pump is connected to the control port through a first pipeline. When the electric pump decompresses the piston loading chamber, the electric pump control current is very small, the electric pump output flow is very small, the pump pressure is also very small, the unloading valve is in an open state, and the high-pressure port is connected to the low-pressure port. Since the high-pressure port is connected to the high-pressure chamber through a high-pressure branch, and the low-pressure port is connected to the low-pressure chamber, the high-pressure chamber and the low-pressure chamber can be connected. At this time, the high-pressure port and the low-pressure port are connected but a pressure difference cannot be established, so that no working medium flows out, and the torque brought is also very small, so that the control is achieved to make the resistance very small and unload. In this process, the retarder unloading system generates a control pressure of the piston loading chamber that controls the unloading valve through the electric pump. Since the electric pump reacts quickly and controls accurately, the unloading reaction speed can be relatively fast and the unloading is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of a retarder unloading system controlled by an electric pump and a solenoid valve provided in an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of a retarder unloading system controlled by an electric pump and a solenoid valve in an oil pumping state provided by an embodiment of the present invention, wherein a solid line is a passage, a dotted line is a short circuit, and an arrow indicates an oil pumping path;

[0029] Figure 3 A schematic diagram of a retarder unloading system controlled by an electric pump and a solenoid valve in a no-load state provided by an embodiment of the present invention, wherein a solid line is a passage, a dotted line is a short circuit, and an arrow indicates an air flow path;

[0030] Figure 4 A schematic structural diagram of a vehicle retarder provided in an embodiment of the present invention.

[0031] icon:

[0032] 10-high pressure branch; 20-first pipeline; 30-second pipeline; 40-first reversing branch; 50-second reversing branch; 60-third pipeline; 70-air branch; 80-oil storage expansion chamber;

[0033] 100-speed retarding mechanism; 110-high pressure chamber; 120-low pressure chamber;

[0034] 200-unloading valve; 210-high pressure port; 220-low pressure port; 230-control port; 240-oil storage cavity port;

[0035] 300-Electric pump;

[0036] 400- reversing valve;

[0037] 500-first solenoid valve;

[0038] 600-Second solenoid valve. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] In addition, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] Reference Figure 1 The present embodiment provides a retarder unloading system controlled by an electric pump and a solenoid valve, the retarder unloading system comprising a retarder mechanism 100, an unloading valve 200 and an electric pump 300; the retarder mechanism 100 has a high-pressure chamber 110 and a low-pressure chamber 120; the unloading valve 200 has a piston loading chamber, the piston loading chamber has a high-pressure port 210, a low-pressure port 220 and a control port 230, the high-pressure port 210 is connected to the high-pressure chamber 110 through a high-pressure branch 10, and the low-pressure port 220 is connected to the low-pressure chamber 120; the electric pump 300 is connected to the control port 230 through a first pipeline 20, the electric pump 300 can decompress the piston loading chamber, and in the decompression state, the unloading valve 200 is in an open state, and the high-pressure port 210 is connected to the low-pressure port 220.

[0047] The retarder unloading system provided by the embodiment is controlled by the electric pump and the solenoid valve. When the electric pump 300 decompresses the piston loading chamber, the control current of the electric pump 300 is very small, the output flow of the electric pump 300 is very small, the pump pressure is also very small, the unloading valve 200 is in an open state, and the high-pressure port is connected with the low-pressure port. Since the high-pressure port 210 is connected with the high-pressure chamber 110 through the high-pressure branch 10, and the low-pressure port 220 is connected with the low-pressure chamber 120, the high-pressure chamber 110 and the low-pressure chamber 120 can be connected. At this time, the high-pressure port and the low-pressure port are connected and the pressure difference cannot be established, so that no working medium flows out, and the torque brought is also very small, so that the control is made to make the resistance very small and unload. In this process, the retarder unloading system generates the control pressure of the piston loading chamber of the unloading valve 200 through the electric pump 300. Since the electric pump 300 reacts quickly and controls accurately, the unloading reaction speed can be relatively fast and the unloading is accurate.

[0048] It should be noted that the high-pressure chamber 110 and the low-pressure chamber 120 are generated by the operation of the deceleration mechanism 100, and high pressure and low pressure are relative. The high-pressure chamber 110 and the low-pressure chamber 120 are conventional names in the art. This is clear to those skilled in the art, and the specific structure of the deceleration mechanism 100 and the specific formation method of the high-pressure chamber 110 and the low-pressure chamber 120 are not described in detail here.

[0049] Specifically, the unloading valve 200 includes a valve body, in which a piston is arranged. The piston divides the cavity in the valve body into a piston loading cavity and a piston unloading cavity, and the volume of the piston loading cavity and the piston unloading cavity increases or decreases with the movement of the piston. Furthermore, an elastic member is provided between the piston and the piston unloading cavity for returning the piston to its original position; optionally, the elastic member may be a spring.

[0050] When the electric pump 300 decompresses the piston loading chamber, the control current of the electric pump 300 is very small, the output flow of the electric pump 300 is very small, and the pump pressure is also very small. At this time, the unloading valve 200 is in an open state under the return action of the elastic member.

[0051] During operation, since the electric pump 300 is connected to the control port 230 through the first pipeline 20, the electric pump 300 can build up pressure on the unloading valve 200. Specifically, in the pressurized state, the piston can move to the right, compress the elastic part, and the unloading valve 200 is closed, that is, the high-pressure port 210 is disconnected from the low-pressure port 220; in the decompressed state, the elastic part returns to the position to move the piston to the left, and the unloading valve 200 is opened, that is, the high-pressure port 210 is connected to the low-pressure port 220.

[0052] In simple terms, the electric pump 300 can generate control pressure for controlling the unloading valve 200. When pressure acts on the left side of the piston, that is, when pressurized, the unloading valve 200 is closed; when there is no pressure on the left side of the piston, the piston returns to its original position under the action of the elastic member, that is, when decompressed, the unloading valve 200 opens, and the retarding mechanism 100 can no longer build up pressure, so it can not generate braking torque, and the retarding mechanism 100 achieves unloading.

[0053] Furthermore, the piston unloading chamber is provided with an oil storage chamber opening 240 , which is connected to the oil storage expansion chamber 80 to meet the gradual increase in pressure in the piston loading chamber. When the piston is pushed to the right, the working medium in the piston unloading chamber is introduced into the oil storage expansion chamber 80 .

[0054] Please continue to refer to Figure 1 The electric pump 300 is connected to the reversing valve 400 through the second pipeline 30 ; the reversing valve 400 is connected to the oil storage expansion chamber 80 through the first reversing branch 40 .

[0055] Through the reversing feature of the reversing valve, the working medium in the oil storage expansion chamber 80 can enter the piston unloading chamber of the unloading valve 200 through the first reversing branch 40, the reversing valve 400 and the electric pump 300 to close the unloading valve 200; conversely, the working medium in the piston unloading chamber of the unloading valve 200 can enter the oil storage expansion chamber 80 through the electric pump 300, the second pipeline 30, the reversing valve 400 and the first reversing branch 40 to open the unloading valve 200.

[0056] Further, refer to Figure 1 and Figure 2 The reversing valve 400 is connected to the high-pressure branch 10 through the second reversing branch 50; the electric pump 300 is connected to the oil storage expansion chamber 80 through the third pipeline 60, and can draw the working medium in the high-pressure chamber 110 and the low-pressure chamber 120 back to the oil storage expansion chamber 80 through the second reversing branch 50, the reversing valve 400, the electric pump 300 and the third pipeline 60.

[0057] Since the high-pressure chamber 110 and the low-pressure chamber 120 of the retarding mechanism 100 are filled with working medium and there is a certain idling resistance, it is necessary to extract the remaining working medium, which can be called the oil extraction state; specifically, the working medium in the high-pressure chamber 110 and the low-pressure chamber 120 can be pumped back to the oil storage expansion chamber 80 through the second reversing branch 50, the reversing valve 400, the electric pump 300 and the third pipeline 60. At this time, most of the working medium in the high-pressure chamber 110 and the low-pressure chamber 120 can be extracted, and only a part of the working medium is left for lubrication. In this way, the problem of large no-load resistance of the retarding mechanism 100 can be solved, and the energy loss of the retarding mechanism 100 when it is idling can be minimized.

[0058] In simple terms, the oil extraction state means that the excess working medium in the working chamber (the high-pressure chamber 110 and the low-pressure chamber 120 ) of the retarder mechanism 100 is extracted, and a portion of the working medium is retained for lubrication.

[0059] Please continue to refer to Figure 2 A first solenoid valve 500 is disposed on the third pipeline 60. When the first solenoid valve 500 is powered off, the electric pump 300 is connected to the oil storage expansion chamber 80, and the high-pressure chamber 110 is connected to the atmosphere.

[0060] In the oil pumping state, the first solenoid valve 500 is de-energized, and the high-pressure chamber 110 (i.e., the oil inlet channel of the working chamber) of the retarding mechanism 100 is connected to the atmosphere. At this time, the excess working medium in the working chamber can be removed, and the remaining part is used for lubrication; at this time, the electric pump 300 still operates with a small pump volume, so a small amount of oil can be output and sprayed to the oil inlet chamber of the working chamber through the small hole, thereby starting the circulation lubrication and heat dissipation function.

[0061] Exemplarily, the first solenoid valve 500 may be a two-position three-way valve.

[0062] Further, see Figure 1 and Figure 3 The retarder unloading system also includes an air branch 70; one end of the air branch 70 is connected to the first solenoid valve 500, and the other end is connected to the high-pressure branch 10; when the first solenoid valve 500 is in the power-off state, the high-pressure chamber 110 is connected to the atmosphere through the air branch 70.

[0063] It should be noted that the normal no-load state of the retarder after the oil pumping state is the reversing state. In the no-load (or reversing) state, the reversing valve 400, the first solenoid valve 500 and the second solenoid valve 600 are all powered off, and the electric pump 300 does not work. The air branch 70 is connected to the atmosphere to provide air for the working chamber. Please continue to refer to Figure 3 A second solenoid valve 600 is also provided on the air branch 70; the second solenoid valve 600 has two connection outlets, one of which is connected to the high-pressure branch 10, and the other is used to connect other branches; wherein the other branches can be used to realize other functions, and if there is no need to connect other branches, the other connection outlet can be closed.

[0064] Exemplarily, the second solenoid valve 600 may be a two-position three-way valve.

[0065] On the basis of the above embodiment, the unloading valve 200 may be provided as one or more. When the unloading valve 200 is provided as multiple, the multiple unloading valves 200 are provided in parallel.

[0066] Exemplarily, when two unloading valves 200 are provided, the two unloading valves 200 are arranged in parallel, and the piston loading chambers of the unloading valves 200 are connected to the high-pressure port 210 through the high-pressure branch 10 , and the low-pressure port 220 is connected to the low-pressure chamber 120 .

[0067] Reference Figure 4 The present embodiment also provides an automobile retarder, including the retarder unloading system controlled by the electric pump and the solenoid valve of the aforementioned embodiment. The automobile retarder provided in the present embodiment also includes the retarder unloading system controlled by the electric pump and the solenoid valve, and thus, the technical advantages and effects that can be achieved by the automobile retarder also include the technical advantages and effects that can be achieved by the retarder unloading system controlled by the electric pump and the solenoid valve, which will not be described in detail here.

[0068] The electric pump 300 is installed on the housing of the retarding mechanism 100 , and can be modified according to the layout requirements of the vehicle, and arranged at other positions of the housing of the retarding mechanism 100 .

[0069] Specifically, the electric pump 300 may be fastened to the housing of the retarder mechanism 100 by means of bolts, screws, and the like.

[0070] In summary, the retarder unloading system of this embodiment is mainly used in automobile retarders, and plays the role of unloading the retarder mechanism 100 by controlling the electric pump 300, the reversing valve 400, the first solenoid valve 500 and the second solenoid valve 600 when the automobile does not need to be decelerated.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A retarder unloading system controlled by an electric pump and a solenoid valve, characterized in that: include: A retarding mechanism (100), an unloading valve (200) and an electric pump (300); The deceleration mechanical device (100) comprises a high-pressure chamber (110) and a low-pressure chamber (120); The unloading valve (200) has a piston loading chamber, the piston loading chamber has a high-pressure port (210), a low-pressure port (220) and a control port (230), the high-pressure port (210) is connected to the high-pressure chamber (110) through a high-pressure branch (10), and the low-pressure port (220) is connected to the low-pressure chamber (120); The electric pump (300) is connected to the control port (230) via a first pipeline (20), and the electric pump (300) is capable of decompressing the piston loading chamber. In the decompressed state, the unloading valve (200) is in an open state, and the high-pressure port (210) is in communication with the low-pressure port (220); The electric pump (300) is connected to the oil storage expansion chamber (80) via a third pipeline (60); The third pipeline (60) is provided with a first solenoid valve (500); The first solenoid valve (500) is a two-position three-way valve; The retarder unloading system controlled by the electric pump and the solenoid valve also includes an air branch (70); One end of the air branch (70) is connected to the first solenoid valve (500), and the other end is connected to the high-pressure branch (10); When the first solenoid valve (500) is in a power-off state, the high-pressure chamber (110) is connected to the atmosphere through the air branch (70).

2. The retarder unloading system controlled by an electric pump and a solenoid valve according to claim 1, characterized in that: The electric pump (300) is connected to a reversing valve (400) via a second pipeline (30); The reversing valve (400) is connected to the oil storage expansion chamber (80) via a first reversing branch (40).

3. The retarder unloading system controlled by an electric pump and a solenoid valve according to claim 2, characterized in that: The reversing valve (400) is connected to the high-pressure branch (10) via a second reversing branch (50); The electric pump (300) is capable of pumping the working medium in the high-pressure chamber (110) and the low-pressure chamber (120) back to the oil storage expansion chamber (80) through the second reversing branch (50), the reversing valve (400), the electric pump (300) and the third pipeline (60).

4. The retarder unloading system controlled by an electric pump and a solenoid valve according to claim 3, characterized in that: When the power is off, the first solenoid valve (500) connects the electric pump (300) with the oil storage expansion chamber (80), and simultaneously connects the high-pressure chamber (110) with the atmosphere.

5. The retarder unloading system controlled by an electric pump and a solenoid valve according to claim 1, characterized in that: The air branch (70) is also provided with a second solenoid valve (600); The second solenoid valve (600) has two connecting outlets, one of which is connected to the high-pressure branch (10).

6. The retarder unloading system controlled by an electric pump and a solenoid valve according to any one of claims 1 to 5, characterized in that: The unloading valve (200) is provided in plurality, and the plurality of unloading valves (200) are arranged in parallel.

7. The retarder unloading system controlled by an electric pump and a solenoid valve according to claim 6, characterized in that: The electric pump (300) is mounted on the housing of the retarding mechanical device (100).

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