An air passage structure for suppressing air loss of a hydraulic retarder pump and a method thereof

Abstract

The application discloses a kind of air path structure and method for inhibiting pump gas loss of hydraulic retarder, belong to vehicle hydraulic auxiliary braking technical field;Air path structure includes air compressor and several air inlet jet devices;Several installation holes and several blades are processed on the fixed wheel of hydraulic retarder;Several blades are evenly distributed on the inner circumferential surface of fixed wheel along the circumference of fixed wheel;Several installation holes are evenly distributed between every two adjacent blades, one end of installation hole is connected with air path structure, and the other end is communicated with the working cavity of hydraulic retarder;Through hole is processed on each air inlet jet device;One end of all air inlet jet devices is merged into a pipeline, and is connected to the air outlet of air compressor by a gas pipe;The other end of each air inlet jet device is respectively and one-to-one installed in the installation hole of fixed wheel.The application injects high-speed air inlet jet into the inside of the working cavity of hydraulic retarder by air inlet jet device, reduces the flow speed of circulating air flow, to inhibit pump gas loss.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle hydraulic auxiliary braking, and particularly relates to an air path structure for inhibiting pump gas loss of a hydraulic retarder and a method thereof. BACKGROUND

[0002] The hydraulic retarder is a kind of vehicle auxiliary braking device, which converts input kinetic energy into liquid internal energy through the interaction of vanes and hydraulic transmission oil, and dissipates the generated heat energy (liquid internal energy) to achieve the effect of retarding braking.

[0003] When the hydraulic retarder is not working, the filling valve no longer fills oil into the working chamber, and the inside of the working chamber is basically filled with air. However, since the driving wheel is connected to the transmission shaft, the high-speed rotating driving wheel vanes will still stir the air to generate energy loss, which is called pump gas loss of the hydraulic retarder. In the non-braking condition of the hydraulic retarder, the pump gas loss accounts for a large proportion compared with other mechanical losses, and the hydraulic retarder is in the non-braking condition for most of the time. Therefore, it is particularly important to study the pump gas loss inhibition method in order to make the vehicle more energy-efficient.

[0004] At present, there are mainly two types of methods for inhibiting pump gas loss. The first type is the clutch type, which separates the driving wheel from the transmission shaft through the clutch to avoid the generation of pump gas loss from the source. However, this method requires an additional operating mechanism and layout space, and the cost is relatively high. The second type is to block part of the flow channel through a mechanical structure to reduce the effective diameter of the circulating circle, and to inhibit the pump gas loss by interfering with the circulation of air in the working chamber. However, the existing baffle type structure may fail due to jamming, and if the mechanical structure falls off, it will cause destructive impact on the hydraulic retarder. SUMMARY

[0005] Therefore, the application provides an air path structure for inhibiting pump gas loss of a hydraulic retarder and a method thereof, which injects high-speed intake jet flow into the inside of the working chamber of the hydraulic retarder through an intake jet flow device to reduce the flow speed of circulating air flow, thereby inhibiting pump gas loss.

[0006] The application is realized by the following technical solutions:

[0007] An air path structure for inhibiting pump gas loss of a hydraulic retarder, the hydraulic retarder comprising: a driving wheel and a driving wheel, and an annular working chamber composed of a cavity of the driving wheel and a cavity of the driving wheel;

[0008] The air path structure comprises: an air compressor and a plurality of intake jet flow devices;

[0009] The fixed wheel is provided with a plurality of mounting holes and a plurality of blades; the plurality of blades are uniformly distributed on the inner circumferential surface of the fixed wheel along the circumferential direction of the fixed wheel; the plurality of mounting holes are uniformly distributed between every two adjacent blades, and one end of the mounting hole is connected to the air path structure and the other end is communicated with the working chamber.

[0010] Each of the air inlet jet devices is provided with a through hole; one end of all the air inlet jet devices is merged into a pipeline and connected to the air outlet of the air compressor through an air pipe; the other end of each of the air inlet jet devices is installed in the mounting hole of the fixed wheel one by one, for injecting the air inlet jet of the air compressor into the working chamber.

[0011] Further, each of the air inlet jet devices is a rotary body structure, and the outer side of the rotary body structure is provided with a shaft shoulder for positioning.

[0012] Further, the circle with the largest diameter of the cavity of the fixed wheel is an outer ring, and the circle with the smallest diameter of the cavity of the fixed wheel is an inner ring; the outer ring is the largest diameter of the working chamber, and the inner ring is the smallest diameter of the working chamber.

[0013] The installation position of the air inlet jet device is close to the outer ring.

[0014] Further, the plurality of air inlet jet devices uniformly distributed between every two adjacent blades form an air inlet jet group.

[0015] The plurality of air inlet jet devices in each of the air inlet jet groups are uniformly distributed along the circumferential direction of the fixed wheel, and the installation position of the air inlet jet device is located on the concentric circle of 0.9 times the effective diameter D of the cycle circle, wherein the effective diameter D of the cycle circle is the diameter of the outer ring.

[0016] Further, the plurality of air inlet jet devices uniformly distributed between every two adjacent blades form an air inlet jet group; the plurality of air inlet jet devices in each of the air inlet jet groups are uniformly distributed along the radial direction of the fixed wheel, and the radial range of the installation position of the air inlet jet device is between the concentric circles of 0.75-0.95 times the effective diameter D of the cycle circle, wherein the effective diameter D of the cycle circle is the diameter of the outer ring.

[0017] Further, the through hole of the air inlet jet device is a straight pipe or a tapered pipe.

[0018] Further, the air path structure further comprises a flow regulating valve; the flow regulating valve is installed on the air pipe and located between the air compressor and the air inlet jet device, for adjusting the flow rate of the air inlet jet.

[0019] Further, the air path structure further comprises an ECU; the ECU is electrically connected with the flow regulating valve, for controlling the flow regulating valve according to the vehicle speed to change the flow rate of the air inlet jet.

[0020] Further, the air path structure further comprises a one-way valve; the one-way valve is installed on the air pipe and located between the flow regulating valve and the air inlet jet device, used for preventing oil from entering the air path structure during normal operation of the hydraulic retarder.

[0021] A method for inhibiting pump gas loss of a hydraulic retarder, based on the above-mentioned air path structure for inhibiting pump gas loss of a hydraulic retarder, the method comprises the following steps:

[0022] The hydraulic retarder stops working, the air compressor starts, and the air compressor injects high-speed air inlet jet flow into the working chamber through the air inlet jet; during the injection of the high-speed air inlet jet flow, the ECU controls the flow regulating valve according to the current vehicle speed to change the flow rate of the air inlet jet flow.

[0023] The injected high-speed air inlet jet flow and the circulating air flow in the working chamber impact at the outer ring, i.e. the junction of the fixed wheel and the movable wheel, to disturb the gas circulation in the working chamber, thereby reducing the flow speed of the circulating air flow and the effective diameter of the circulating circle, and inhibiting the pump gas loss.

[0024] Advantages:

[0025] (1) The air path structure for inhibiting pump gas loss of a hydraulic retarder comprises an air compressor and a plurality of air inlet jet devices, one end of all the air inlet jet devices is connected to the air outlet of the air compressor through a pipe, and the other end of each air inlet jet device is installed in the mounting hole of the fixed wheel in one-to-one correspondence, used for injecting the air inlet jet flow of the air compressor into the working chamber. The air path structure injects high-speed air inlet jet flow into the working chamber of the hydraulic retarder, disturbs the gas circulation in the working chamber, reduces the flow speed of the circulating air flow, and reduces the effective diameter of the circulating circle, thereby achieving the inhibition of pump gas loss.

[0026] (2) The air path structure for inhibiting pump gas loss of a hydraulic retarder comprises a rotary body structure, and a shaft shoulder is formed on the outer side of the rotary body structure for positioning. When the end of the shaft shoulder close to the fixed wheel is attached to the outer wall of the fixed wheel, it can be confirmed that the air inlet jet device is installed in place.

[0027] (3) The air path structure for inhibiting pump gas loss of a hydraulic retarder comprises an air inlet jet device, and the installation position of the air inlet jet device is close to the outer ring, which can ensure the inhibition effect of pump gas loss.

[0028] (4) The air path structure for inhibiting pump gas loss of a hydraulic retarder further comprises a flow regulating valve and an ECU, and the ECU can control the flow regulating valve to change the flow rate of the air inlet jet flow.

[0029] (5) The air path structure for inhibiting the pump gas loss of the hydraulic retarder, further comprising a one-way valve, which is installed on the air pipe and located between the flow regulating valve and the air inlet jet device, and through the installation of the one-way valve, the oil liquid can be prevented from entering the air path structure during the normal operation of the hydraulic retarder, so that the hydraulic retarder can work normally and provide the required braking torque.

[0030] (6) The method for inhibiting the pump gas loss of the hydraulic retarder, when the hydraulic retarder stops working, the high-speed gas jet is injected into the wheel cavity through the air inlet jet device, so that the circulating gas flow in the wheel cavity collides with the high-speed gas jet at the junction of the outer ring of the driving wheel and the fixed wheel, the gas circulation in the wheel cavity is disturbed, the flow speed of the circulating gas flow is reduced, the effective diameter of the circulating circle is reduced, and thus the pump gas loss is inhibited. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a schematic diagram of the air path structure of the present application;

[0032] Figure 2 It is a three-dimensional structure diagram of the overall distribution of the air inlet jet device (close to the working cavity);

[0033] Figure 3 It is a three-dimensional structure diagram of the overall distribution of the air inlet jet device (close to the air path structure);

[0034] Figure 4 It is a schematic diagram of the overall distribution of the air inlet jet device;

[0035] Figure 5 It is a schematic diagram of a set of circumferentially distributed air inlet jet devices of the present application;

[0036] Figure 6 It is a schematic diagram of a set of radially distributed air inlet jet devices of the present application;

[0037] Figure 7 It is a sectional view of the straight pipe air inlet jet device of the present application;

[0038] Figure 8 It is a sectional view of the tapered pipe air inlet jet device of the present application;

[0039] Among them, 1-air compressor, 2-ECU, 3-air pipe, 4-flow regulating valve, 5-one-way valve, 6-air inlet jet device, 7-working cavity, 8-fixed wheel, 9-driving wheel, 10-liquid filling valve, 11-liquid discharge valve, 61-air inlet jet group, 81-vane, 82-outer ring, 83-inner ring. DETAILED DESCRIPTION

[0040] The present application will be described in detail below in conjunction with the drawings and examples.

[0041] Example 1:

[0042] This embodiment provides an air path structure for suppressing pumping air loss in a hydraulic retarder, which is installed on the hydraulic retarder;

[0043] like Figure 1 As shown, the hydraulic retarder includes: a fixed wheel 8 and a moving wheel 9, and an annular working chamber 7 formed by the cavities on the fixed wheel 8 and the moving wheel 9; the fixed wheel 8 is machined with a plurality of mounting holes and a plurality of blades 81; the plurality of blades 81 are evenly distributed on the inner circumferential surface of the fixed wheel 8 along the circumference of the end of the fixed wheel 8 near the moving wheel 9; the plurality of mounting holes are evenly distributed between every two adjacent blades 81, one end of the mounting hole is connected to an air passage structure, and the other end is connected to the working chamber 7; when the hydraulic retarder is working, the oil in the oil tank is injected into the working chamber 7 of the hydraulic retarder through the filling valve 10, and then flows back to the oil tank through the drain valve 11; Figure 2 and Figure 4 As shown, let the circle with the largest diameter of the cavity of the fixed wheel 8 be the outer ring 82, and the circle with the smallest diameter of the cavity of the fixed wheel 8 be the inner ring 83; as Figure 1 As shown, the outer ring 82 of the fixed wheel 8 is the point where the diameter of the working chamber 7 is the largest, and the inner ring 83 of the fixed wheel 8 is the point where the diameter of the working chamber 7 is the smallest.

[0044] like Figure 1 As shown, the air circuit structure for suppressing pumping air loss in the hydraulic retarder includes: an air compressor 1, an ECU 2, an air pipe 3, a flow regulating valve 4, a one-way valve 5, and several air intake jet devices 6; wherein the ECU 2 is an electronic control unit, and the ECU 2 is electrically connected to the flow regulating valve 4;

[0045] Each of the aforementioned air intake jet devices 6 is a rotating body structure with an axial through hole; the outer side of the rotating body structure is machined with a shoulder for positioning. When the end of the shoulder near the fixed wheel 8 is in contact with the outer wall of the fixed wheel 8, it indicates that the installation is in place; such as Figure 5 and Figure 6 As shown, the internal through-hole of each of the air intake jet devices 6 can be a straight pipe or a tapered pipe; in this embodiment, the air intake jet device 6 is installed in the mounting hole of the fixed wheel 8 by a threaded connection; one end of all the air intake jet devices 6 merges into a pipeline and is connected to the air outlet of the air compressor 1 through an air pipe 3; as shown Figure 2 , Figure 7 and Figure 8 As shown, the other end of each of the air intake jet devices 6 is respectively installed in the mounting holes of the fixed wheel 8;

[0046] The flow regulating valve 4 and the one-way valve 5 are installed sequentially on the air pipe 3 and located between the air compressor 1 and the air intake jet device 6;

[0047] The intake jet device 6 is used to inject intake jet into the working chamber 7, the flow regulating valve 4 is used to regulate the flow rate of the intake jet provided by the air compressor 1, the one-way valve 5 is used to prevent oil from entering the air path structure during the normal operation of the hydraulic retarder; the ECU 2 can control the flow regulating valve 4 according to the current vehicle speed to change the flow rate of the intake jet;

[0048] The plurality of intake jet devices 6 evenly distributed between every two adjacent blades 81 of the fixed wheel 8 form an intake jet group 61; in this embodiment, there are twenty-four intake jet devices 6, and every three intake jet devices 6 form an intake jet group 61; as shown in Figure 3 and Figure 4 The distribution form of more than one intake jet device 6 in each intake jet group 61 can be circumferentially uniform or radially uniform; the installation position of the intake jet device 6 is close to the outer ring 82, which is used to improve the inhibition effect of pump loss; when the distribution form of the plurality of intake jet devices 6 in each intake jet group 61 is circumferentially uniform, the installation position of the intake jet device 6 is located on the concentric circle of 0.9 times the effective diameter D of the circulation circle; when the distribution form of the plurality of intake jet devices 6 in each intake jet group 61 is radially uniform, the radial range of the installation position of the intake jet device 6 is between the concentric circles of 0.75-0.95 times the effective diameter D of the circulation circle, wherein the effective diameter D of the circulation circle refers to the diameter of the outer ring 82;

[0049] Working principle:

[0050] When the hydraulic retarder works (i.e. in the braking state), the oil flows into the working chamber 7 of the hydraulic retarder through the liquid filling valve 10, and flows back to the oil tank through the liquid discharge valve 11 to provide braking torque, at this time the air compressor 1 stops working;

[0051] When the hydraulic retarder stops working (i.e. in the non-braking state), the working chamber 7 is filled with air; at this time the air compressor 1 injects high-speed intake jet into the working chamber 7 through the intake jet device 6 on the fixed wheel 8, so as to realize the best flow rate matching between the circulating air flow (the arrow in Figure 1 in the working chamber 7) and the high-speed intake jet (the arrow in Figure 1 from the intake jet device 6 into the working chamber 7), that is, the two impact at the junction of the fixed wheel 8 and the driving wheel 9, that is, at the outer ring 82, disturb the gas circulation in the working chamber 7, reduce the circulating air flow speed, reduce the effective diameter of the circulation circle, and realize the inhibition of pump loss.

[0052] Embodiment 2:

[0053] This embodiment provides a method for inhibiting pump loss of a hydraulic retarder based on the embodiment 1, the method is:

[0054] When the hydraulic retarder stops working, the air compressor 1 starts, and the air compressor 1 injects a high-speed air jet into the working chamber 7 through the air inlet jet 6; during the injection of the high-speed air jet, the ECU 2 controls the flow regulating valve 4 according to the current vehicle speed to change the flow rate of the air jet;

[0055] The injected high-speed air jet collides with the circulating air flow inside the working chamber 7 at the outer ring 82, that is, the junction of the fixed wheel 8 and the movable wheel 9, disturbs the gas circulation inside the working chamber 7, thereby reducing the flow speed of the circulating air flow, reducing the effective diameter of the circulating circle, and inhibiting the pumping loss.

[0056] To sum up, the above is only a preferred embodiment of the present application, not for limiting the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pneumatic path structure for suppressing pumping air loss in a hydraulic retarder, the hydraulic retarder comprising: The fixed wheel (8) and the moving wheel (9) form an annular working cavity (7) consisting of the cavity of the fixed wheel (8) and the cavity of the moving wheel (9). The gas path structure is characterized by comprising: an air compressor (1) and several air intake jet devices (6). The fixed wheel (8) is machined with a number of mounting holes and a number of blades (81); the number of blades (81) are evenly distributed on the inner circumferential surface of the fixed wheel (8) along the circumference; the number of mounting holes are evenly distributed between every two adjacent blades (81), one end of the mounting hole is connected to the air passage structure and the other end is connected to the working chamber (7). Each of the air intake jet devices (6) is machined with a through hole; one end of all the air intake jet devices (6) is merged into a pipeline and connected to the air outlet of the air compressor (1) through an air pipe (3); the other end of each of the air intake jet devices (6) is respectively installed in the mounting hole of the fixed wheel (8) to inject the air intake jet of the air compressor (1) into the working chamber (7); Let the circle with the largest diameter of the cavity of the fixed wheel (8) be the outer ring (82), and the circle with the smallest diameter of the cavity of the fixed wheel (8) be the inner ring (83); the outer ring (82) is the largest diameter of the working cavity (7), and the inner ring (83) is the smallest diameter of the working cavity (7); The air intake jet device (6) is installed near the outer ring (82).

2. The air path structure for suppressing pump air loss in a hydraulic retarder as described in claim 1, characterized in that, Each of the aforementioned air intake jet devices (6) is a rotating body structure with a shoulder machined on the outer side of the rotating body structure for positioning.

3. The air path structure for suppressing pump air loss in a hydraulic retarder as described in claim 1, characterized in that, Multiple air intake jet devices (6) evenly distributed between each two adjacent blades (81) form an air intake jet group (61). Multiple air intake jet devices (6) in each group of air intake jet groups (61) are evenly distributed along the circumference of the fixed wheel (8). The installation position of the air intake jet device (6) is located on a concentric circle with a circulation circle effective diameter D of 0.9 times, where the circulation circle effective diameter D is the diameter of the outer ring (82).

4. The air path structure for suppressing pump air loss in a hydraulic retarder as described in claim 1, characterized in that, Multiple air intake jet devices (6) evenly distributed between each two adjacent blades (81) form an air intake jet group (61); the multiple air intake jet devices (6) in each air intake jet group (61) are evenly distributed along the radial direction of the fixed wheel (8), and the radial range of the installation position of the air intake jet device (6) is between 0.75 and 0.95 times the effective diameter D of the circulation circle, where the effective diameter D of the circulation circle is the diameter of the outer ring (82).

5. The air path structure for suppressing pump air loss in a hydraulic retarder as described in any one of claims 1-4, characterized in that, The through hole of the air intake jet device (6) is a straight pipe or a tapered pipe.

6. The air path structure for suppressing pump air loss in a hydraulic retarder as described in claim 1, characterized in that, The air path structure also includes a flow regulating valve (4); the flow regulating valve (4) is installed on the air pipe (3) and located between the air compressor (1) and the air intake jet device (6) to regulate the flow rate of the air intake jet.

7. The air path structure for suppressing pump air loss in a hydraulic retarder as described in claim 6, characterized in that, The air circuit structure also includes an ECU (2); the ECU (2) is electrically connected to the flow regulating valve (4) and is used to control the flow regulating valve (4) according to the vehicle speed to change the flow rate of the intake jet.

8. The air path structure for suppressing pump air loss in a hydraulic retarder as described in claim 7, characterized in that, The air circuit structure also includes a one-way valve (5); the one-way valve (5) is installed on the air pipe (3) and located between the flow regulating valve (4) and the air inlet jet device (6) to prevent oil from entering the air circuit structure during normal operation of the hydraulic retarder.

9. A method for suppressing pumping air loss in a hydraulic retarder, based on the air path structure for suppressing pumping air loss in a hydraulic retarder as described in claim 7 or 8, characterized in that, The method is as follows: The hydraulic retarder stops working, the air compressor (1) starts, and the air compressor (1) injects high-speed air jet into the working chamber (7) through the air jet device (6); during the high-speed air jet injection process, the ECU (2) controls the flow regulating valve (4) according to the current vehicle speed to change the air jet flow rate. The injected high-speed intake jet impacts the circulating airflow inside the working chamber (7) at the outer ring (82), that is, at the junction of the fixed wheel (8) and the moving wheel (9), disturbing the gas circulation inside the working chamber (7), thereby reducing the flow speed of the circulating airflow, reducing the effective diameter of the circulation circle, and suppressing pumping losses.

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