Air pressure control system of parallel hydraulic retarder

Abstract

An air pressure control system of a parallel type hydraulic retarder comprises an air source, an oil pool shell and an exhaust port, and further comprises a rapid air inlet unit enabling the air source to be communicated with the oil pool shell and a rapid exhaust unit enabling the exhaust port to be communicated with the air source and the oil pool shell. The rapid air inlet unit comprises a first air inlet channel communicated with an air source, the first air inlet channel is sequentially connected with a rapid air inlet electromagnetic valve and a first air inlet of the air pressure valve in series, the rapid air inlet unit further comprises a third air inlet channel communicated with the air source, and the third air inlet channel is connected with a second air inlet of the air pressure valve in series. An air inlet of the air pressure valve is connected with the oil pool shell in series. Through reasonable arrangement of component structures, the rapid air inlet unit and the rapid exhaust unit are matched to achieve rapid air inlet and exhaust, rapid response to work and quit of the retarder is achieved, and the work response time and the work quit response time are shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of retarders, and particularly relates to a pneumatic control system for a parallel hydraulic retarder. Background Art

[0002] With the implementation of the national regulation GB7258-2017, retarders have been widely popularized in China and have become a standard configuration in the commercial vehicle industry. When using a retarder, according to different vehicle speeds, vehicle weights, road conditions, etc., the braking torque required by the retarder is different, and the braking torque of the retarder is adjusted by adjusting the air pressure of the retarder. The existing retarder adjusts the pressure by adjusting the opening of the proportional valve. The proportional valve has only one air inlet channel and one exhaust channel, and the adjustment sensitivity is poor, the response is slow, and when it gets stuck, it will cause problems such as the retarder being unable to work or unable to exit the working state. Summary of the Invention

[0003] In view of the above problems, the purpose of the present invention is to provide a pneumatic control system for a parallel hydraulic retarder, which solves the problems of poor sensitivity and slow response of the existing system.

[0004] To achieve the above purpose, the technical solutions adopted by the present invention include:

[0005] A pneumatic control system for a parallel hydraulic retarder includes an air source, an oil sump housing, and an exhaust port. It includes a fast intake unit that connects the air source to the oil sump housing, and also includes a fast exhaust unit that connects the exhaust port to the air source and the oil sump housing; the fast intake unit includes a first intake channel connected to the air source, the first intake channel is sequentially connected in series with a fast intake solenoid valve and a first intake inlet of a pneumatic valve, the fast intake unit also includes a third intake channel connected to the air source, the third intake channel is connected in series with a second intake inlet of the pneumatic valve, and the intake outlet of the pneumatic valve is connected in series with the oil sump housing.

[0006] Preferably, the fast exhaust unit includes a first exhaust channel connected to the air source, the first exhaust channel is sequentially connected in series with a fast exhaust solenoid valve and a first exhaust inlet of a pneumatic valve, the oil sump housing is connected in series with a second exhaust inlet of the pneumatic valve, and the exhaust outlet of the pneumatic valve is connected in series with the exhaust port.

[0007] Furthermore, it also includes an auxiliary intake unit that connects the air source to the oil sump housing, and also includes an auxiliary exhaust unit that connects the oil sump housing to the exhaust port.

[0008] Preferably, the auxiliary intake unit includes a fourth intake channel connected to the air source, and the fourth intake channel is sequentially connected in series with an auxiliary intake solenoid valve and the oil sump housing.

[0009] Preferably, the auxiliary exhaust unit includes an auxiliary exhaust solenoid valve that connects the oil sump housing to the exhaust port.

[0010] Further, it further includes a safety exhaust unit connected in parallel with the auxiliary exhaust unit.

[0011] Preferably, the safety exhaust unit includes a safety valve that connects the oil sump housing to the exhaust port.

[0012] Preferably, a pressure sensor is provided on the oil sump housing.

[0013] Preferably, the other outlet of the fast intake solenoid valve and the other outlet of the fast exhaust solenoid valve are connected to the exhaust port.

[0014] Compared with the prior art, the advantages of the present invention are as follows:

[0015] (1) For the pneumatic control system of the parallel hydraulic retarder of the present invention, through the reasonable setting of the component structure, the fast intake unit and the fast exhaust unit cooperate to achieve fast intake and exhaust, realize the fast response of the retarder during operation and exit, and reduce the response time during operation and exit.

[0016] (2) For the pneumatic control system of the parallel hydraulic retarder of the present invention, through the reasonable setting of the component structure, without adding components, the fast intake and exhaust of gas are realized by relying on the pneumatic valve. Moreover, because it is a pneumatic structure and both the fast intake solenoid valve and the fast exhaust solenoid valve have small diameters, the reliability of the product is greatly increased, and no extra components need to be added, reducing potential hazards.

[0017] (3) For the pneumatic control system of the parallel hydraulic retarder of the present invention, through the reasonable setting of the component structure, the auxiliary intake unit and the auxiliary exhaust unit effectively improve the sensitivity and accuracy of the braking torque fluctuation adjustment during the operation of the retarder.

[0018] (4) For the pneumatic control system of the parallel hydraulic retarder of the present invention, through the reasonable setting of the component structure, the safety valve exhaust unit prevents the entry of excessive air pressure, which may damage the retarder, and improves the reliability of the retarder during operation.

[0019] (5) For the pneumatic control system of the parallel hydraulic retarder of the present invention, through the reasonable setting of the component structure, the parallel structure design ensures that even if a certain solenoid valve is damaged, it will not affect the normal use of the retarder, effectively improving the reliability of the retarder; at the same time, it can be directly applied to different types of retarders, with good compatibility. Description of the Drawings

[0020] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the following specific embodiments to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0021] Figure 1It is a schematic structural diagram of the pneumatic control system of the parallel hydraulic retarder of the present invention;

[0022] Figure 2 is Figure 1 Schematic diagrams of the air inlet and exhaust channels of the unit ( Figure 2 In [reference], the red path is the rapid air intake unit, the purple is the rapid exhaust unit, the blue is the auxiliary air intake unit, the green is the auxiliary exhaust unit, and the pink is the safety valve exhaust unit).

[0023] Each label in the figure is represented as follows:

[0024] 1 - air source, 2 - rapid air intake solenoid valve, 3 - rapid exhaust solenoid valve, 4 - pneumatic valve, 5 - auxiliary air intake solenoid valve, 6 - auxiliary exhaust solenoid valve, 7 - safety valve, 8 - pressure sensor, 9 - oil sump housing, 10 - exhaust port;

[0025] 11 - first air intake channel, 12 - second air intake channel, 13 - third air intake channel, 14 - first air intake and exhaust channel, 15 - second air intake and exhaust channel, 16 - third air intake and exhaust channel, 17 - first exhaust channel, 18 - second exhaust channel, 19 - third exhaust channel, 20 - fourth exhaust channel, 21 - fifth exhaust channel, 22 - sixth exhaust channel, 23 - fourth air intake channel, 24 - fifth air intake channel, 25 - seventh exhaust channel, 26 - eighth exhaust channel, 27 - ninth exhaust channel, 28 - tenth exhaust channel, 29 - eleventh exhaust channel. Specific embodiments

[0026] The invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0027] It should be noted that the directional terms mentioned in this article are all consistent with the specific directions on the paper surface of the specification drawings or the corresponding directions in the space shown in the drawings; all components and devices in the present invention, unless otherwise specified, all adopt the components and devices known in the prior art.

[0028] Embodiment

[0029] This embodiment discloses a pneumatic control system for a parallel hydraulic retarder, including an air source 1, an oil sump housing 9 and an exhaust port 10. It includes a rapid air intake unit that connects the air source 1 to the oil sump housing 9, and also includes a rapid exhaust unit that connects the exhaust port 10 to the air source 1 and the oil sump housing 9; its function is: through the cooperation of the rapid air intake unit and the rapid exhaust unit, rapid air intake and exhaust are realized, rapid response for the retarder to work and withdraw is achieved, and the response time for working and withdrawing from work is reduced.

[0030] The rapid intake unit of this embodiment includes a first intake passage 11 connected to the air source 1. The first intake passage 11 is successively connected in series to the first intake inlet of the rapid intake solenoid valve 2 and the pressure valve 4. The rapid intake unit further includes a third intake passage 13 connected to the air source 1. The third intake passage 13 is connected in series to the second intake inlet of the pressure valve 4. The intake outlet of the pressure valve 4 is connected in series to the oil sump housing 9.

[0031] Its function is as follows: The air source 1 supplies air source for the retarder of the whole vehicle. The direct intake passages of the rapid intake solenoid valve 2 and the pressure valve 4 are also in a parallel structure, that is, there are two parallel intake passages, namely the first intake passage 11 and the third intake passage 13, designed at the air intake joint of the air source 1. Among them, the first intake passage 11 is successively connected to the intake air path between the rapid intake solenoid valve 2 and the pressure valve 4, and the other first intake passage 11 is connected to the intake air path between the pressure valve 4. However, the latter must be connected after the former is connected and the pressure valve 4 is opened, with a sequential order.

[0032] When using the retarder, the rapid intake solenoid valve 2 is energized, and the gas can enter the pressure valve 4 from the air source 1 successively through the first intake passage 11, the rapid intake solenoid valve 2, the second intake passage 12 and the first intake inlet of the pressure valve 4, enabling the second intake inlet of the pressure valve 4 to be connected. Therefore, the gas directly enters the pressure valve 4 from the air source 1 through the third intake passage 13 and the second intake inlet of the pressure valve 4, and successively enters the oil sump housing 9 through the intake passage of the first intake and exhaust passage 14, the intake passage of the second intake and exhaust passage 15 and the intake passage of the third intake and exhaust passage 16. The oil sump housing 9 is pressurized to quickly press the retarder oil into the working chamber of the retarder. The retarder works to generate braking torque, realizing the rapid response of the retarder and shortening the response time.

[0033] The rapid intake solenoid valve 2 disclosed in this embodiment needs to be a large-diameter intake solenoid valve to meet the requirement of the vehicle to build pressure in an extremely short time. Existing products with a diameter of Φ3 - Φ6 can be selected for type selection.

[0034] The pressure valve 4 disclosed in this embodiment is a three-position three-way pressure valve. Without adding components, it realizes the fast intake and fast exhaust of gas by relying on the pressure valve 4. And because it is a pneumatic structure, the rapid intake solenoid valve 2 and the rapid exhaust solenoid valve 3 that cooperate with its intake are both of small diameter, greatly increasing the product reliability and not adding redundant components, reducing potential hidden dangers.

[0035] The rapid exhaust unit of this embodiment includes a first exhaust passage 17 connected to the air source 1. The first exhaust passage 17 is successively connected in series to the first exhaust inlet of the rapid exhaust solenoid valve 3 and the pressure valve 4. The oil sump housing 9 is connected in series to the second exhaust inlet of the pressure valve 4. The exhaust outlet of the pressure valve 4 is connected in series to the exhaust port 10.

[0036] Its function is as follows: when the retarder is turned off, the quick exhaust solenoid valve 3 is energized, and gas can flow from the gas source 1 through the first exhaust passage 17, the quick exhaust solenoid valve 3, the second exhaust passage 18, and the first exhaust inlet of the pneumatic valve 4 into the pneumatic valve 4 in sequence, making the exhaust outlet of the pneumatic valve 4 connected. Therefore, the gas in the oil sump housing 9 will flow into the pneumatic valve 4 through the exhaust passage of the third air intake and exhaust passage 16, the exhaust passage of the second air intake and exhaust passage 15, the exhaust passage of the first air intake and exhaust passage 14, and the second exhaust inlet of the pneumatic valve 4 in sequence, and then pass through the third exhaust passage 19, the fourth exhaust passage 20, the fifth exhaust passage 21, and the sixth exhaust passage 22 in sequence from the exhaust outlet of the pneumatic valve 4, and finally be discharged through the exhaust port 10, realizing the rapid pressure relief of the oil sump housing 9. When the retarder quickly exits the working state, there is no braking torque.

[0037] Specifically, it further includes an auxiliary air intake unit connecting the gas source 1 and the oil sump housing 9, and an auxiliary exhaust unit connecting the oil sump housing 9 and the exhaust port 10.

[0038] Its function is as follows: during the use of the retarder, it is necessary to adjust the braking torque in real time. Especially during constant speed cruise, the auxiliary air intake unit and the auxiliary exhaust unit can be used alternately at intervals to adjust the pressure of the oil sump housing 9, and then adjust the braking torque of the retarder.

[0039] Among them, a pressure sensor 8 is provided on the oil sump housing 9 disclosed in this embodiment to monitor the pressure of the oil sump housing 9 in real time, effectively improving the control accuracy of the braking torque of the retarder.

[0040] The auxiliary air intake unit of this embodiment includes a fourth air intake passage 23 communicating with the gas source 1. The fourth air intake passage 23 is connected in series with an auxiliary air intake solenoid valve 5 and the oil sump housing 9 in sequence.

[0041] Its function is as follows: during the working process of the retarder, when the system recognizes that the retarder torque needs to be increased or the pressure sensor 8 detects a decrease in pressure, the auxiliary air intake solenoid valve 5 is energized, and gas can enter the auxiliary air intake solenoid valve 5 from the gas source 1 through the fourth air intake passage 23, and then enter the oil sump housing 9 through the fifth air intake passage 24 and the air intake passage of the third air intake and exhaust passage 16 in sequence, increasing the pressure of the oil sump housing 9 and increasing the braking torque of the retarder.

[0042] The auxiliary exhaust unit of this embodiment includes an auxiliary exhaust solenoid valve 6 connecting the oil sump housing 9 and the exhaust port 10.

[0043] Its function is as follows: During the operation of the retarder, when the system recognizes that the torque of the retarder needs to be reduced or the pressure sensor 8 detects an increase in pressure, the auxiliary exhaust solenoid valve 6 is energized. The gas in the oil sump housing 9 can then pass through the exhaust passage of the third intake and exhaust passage 16 and the seventh exhaust passage 25 into the auxiliary exhaust solenoid valve 6 in sequence, and then pass through the eighth exhaust passage 26 and the sixth exhaust passage 22, and finally be discharged through the exhaust port 10. Thus, the pressure in the oil sump housing 9 is reduced, and the braking torque of the retarder is decreased.

[0044] Specifically, it also includes a safety exhaust unit connected in parallel with the auxiliary exhaust unit;

[0045] Its function is as follows: When the pressure sensor 8 detects that the pressure in the oil sump housing is greater than the set safety air pressure, the safety exhaust unit opens to relieve the pressure; when the pressure is less than the set safety air pressure, the safety exhaust unit closes to disconnect this exhaust passage; this prevents excessive air pressure from damaging the retarder and improves the reliability of the retarder during operation.

[0046] The safety exhaust unit of this embodiment includes a safety valve 7 that connects the oil sump housing 9 to the exhaust port 10;

[0047] Its function is as follows: When the pressure of the retarder is greater than the set pressure of the safety valve, the safety valve 7 opens. Therefore, the gas in the oil sump housing 9 will pass through the exhaust passage of the third intake and exhaust passage 16, the exhaust passage of the second intake and exhaust passage 15, and the ninth exhaust passage 27 into the safety valve 7 in sequence, and then pass through the tenth exhaust passage 28, the fifth exhaust passage 21, and the sixth exhaust passage 22, and finally be discharged through the exhaust port 10. Thus, the pressure in the oil sump housing 9 is reduced. When the pressure in the oil sump housing 9 is less than the opening pressure of the pressure valve 7, the safety valve 7 closes. Therefore, the retarder can be protected from being damaged by excessive pressure.

[0048] When the fast intake solenoid valve 2 and the fast exhaust solenoid valve 3 of this embodiment are not working, the other outlet of the fast intake solenoid valve 2 and the other outlet of the fast exhaust solenoid valve 3 are both connected to the exhaust port 10 through the eleventh exhaust passage 29, the fourth exhaust passage 20, the fifth exhaust passage 21, and the sixth exhaust passage 22 in sequence, that is, they are in communication with the atmosphere.

[0049] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept scope of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0050] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure does not further explain various possible combination methods.

[0051] In addition, any combination can be made among the various different embodiments disclosed in this solution, as long as it does not violate the idea of this disclosure, and it should equally be regarded as the content invented in this disclosure.

Claims

1. A pneumatic control system for a parallel hydraulic retarder, comprising an air source (1), an oil sump housing (9) and an exhaust port (10), characterized in that, It includes a quick intake unit that connects the air source (1) to the oil sump housing (9), and also includes a quick exhaust unit that connects the exhaust port (10) to the air source (1) and the oil sump housing (9). The quick intake unit includes a first intake passage (11) connected to the air source (1). The first intake passage (11) is sequentially connected in series to the first intake inlet of the quick intake solenoid valve (2) and the pressure valve (4). The quick intake unit also includes a third intake passage (13) connected to the air source (1). The third intake passage (13) is connected in series with the second intake inlet of the pressure valve (4). The intake outlet of the pressure valve (4) is connected in series with the oil sump housing (9).

2. The air pressure control system of a parallel hydraulic retarder according to claim 1, characterized in that, The quick exhaust unit includes a first exhaust passage (17) connected to the air source (1). The first exhaust passage (17) is sequentially connected in series to the first exhaust inlet of the quick exhaust solenoid valve (3) and the pressure valve (4). The oil sump housing (9) is connected in series with the second exhaust inlet of the pressure valve (4). The exhaust outlet of the pressure valve (4) is connected in series with the exhaust port (10).

3. The air pressure control system of a parallel hydraulic retarder according to any one of claims 1 or 2, characterized in that, It also includes an auxiliary intake unit that connects the air source (1) to the oil sump housing (9), and also includes an auxiliary exhaust unit that connects the oil sump housing (9) to the exhaust port (10).

4. The air pressure control system of a parallel hydraulic retarder according to claim 3, characterized in that, The auxiliary intake unit includes a fourth intake passage (23) connected to the air source (1). The fourth intake passage (23) is sequentially connected in series to the auxiliary intake solenoid valve (5) and the oil sump housing (9).

5. The pneumatic control system of a parallel hydraulic retarder according to claim 3, characterized in that The auxiliary exhaust unit includes an auxiliary exhaust solenoid valve (6) that connects the oil sump housing (9) to the exhaust port (10).

6. The air pressure control system of a parallel hydraulic retarder according to claim 3, characterized in that, It also includes a safety exhaust unit connected in parallel with the auxiliary exhaust unit.

7. The pneumatic control system of a parallel hydraulic retarder according to claim 6, characterized in that, The safety exhaust unit includes a safety valve (7) that connects the oil sump housing (9) to the exhaust port (10).

8. The air pressure control system of a parallel hydraulic retarder according to claim 6, characterized in that, A pressure sensor (8) is provided on the oil sump housing (9).

9. The pneumatic control system of a parallel hydraulic retarder according to claim 2, characterized in that, The other outlet of the quick intake solenoid valve (2) and the other outlet of the quick exhaust solenoid valve (3) are connected to the exhaust port (10).

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