CN216867355U - Retarder system and vehicle transmission system thereof - Google Patents
Retarder system and vehicle transmission system thereof Download PDFInfo
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- CN216867355U CN216867355U CN202123438657.0U CN202123438657U CN216867355U CN 216867355 U CN216867355 U CN 216867355U CN 202123438657 U CN202123438657 U CN 202123438657U CN 216867355 U CN216867355 U CN 216867355U
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Abstract
The utility model relates to the technical field of mechanical transmission, in particular to a retarder system and a vehicle transmission system thereof. The retarder system comprises: the system comprises an oil tank, a retarding pump, an auxiliary pump and a heat exchanger; oil liquid is stored in the oil tank; the speed reducing pump is a rotor pump, and a rotor connected with a part to be subjected to speed reducing is arranged in the speed reducing pump; the liquid outlet department of retarder pump is provided with the orifice, when the retarder pump pumped fluid, fluid was in under the drive of retarder pump gradually to the liquid outlet of retarder pump piles up gradually the restriction of orifice forms the aperture throttle down, realizes the conversion that rotor kinetic energy arrives oil hydraulic pressure potential energy again to heat energy, realizes the retarding braking. The vehicle transmission system at least comprises the retarder system. The retarder system provided by the utility model has the advantages of simple structure, strong part adaptability, small volume, light weight and low cost compared with the existing like products, and can form a simple anti-lock function.
Description
Technical Field
The utility model relates to the technical field of mechanical transmission, in particular to a retarder system and a vehicle transmission system thereof.
Background
The urban road intersections are many, the bus stops are dense, the passenger flow is large, and the buses are frequently braked; the mountain roads are steep and have many sharp bends, and medium and large trucks and buses running on the mountain road section for a long time also need to be braked frequently.
Under the condition of long-time frequent work, the brake shoes are quickly worn, the service life of the brake friction plates is short, and the loss of braking force or great reduction of braking performance is caused by the heat fading of the brake, which also becomes the main cause of traffic accidents. Therefore, it is necessary to equip an auxiliary braking system.
The retarder is used as an auxiliary braking component of the vehicle, reduces the load of the braking system of the original vehicle by acting on the transmission system of the original vehicle, enables the vehicle to uniformly decelerate, improves the reliability of the braking system of the vehicle, prolongs the service life of the braking system, and can greatly reduce the use cost of the vehicle.
At present, a common eddy current retarder needs to be equipped with a powerful electromagnetic induction device, and is large in size and inconvenient to use due to heavy engine bodies. The cost is high, and the wet and slippery road surface cannot be used due to the fact that the anti-lock performance cannot be achieved.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the existing retarding equipment has huge size and heavy machine body which is not convenient to use.
(II) technical scheme
In order to solve the above technical problem, an embodiment of an aspect of the present invention provides a retarder system, including: the system comprises an oil tank, a retarding pump, an auxiliary pump and a heat exchanger;
oil liquid is stored in the oil tank;
the speed reducing pump is a rotor pump, a rotor is arranged in the speed reducing pump, the rotor is connected with a part to be subjected to speed reducing, and the part to be subjected to speed reducing drives the rotor to rotate; the speed reducing pump is connected with an oil tank pipeline, and oil circularly flows between the speed reducing pump and the oil tank; an orifice is arranged at the liquid outlet of the retarder pump, when the retarder pump pumps oil, the oil is gradually accumulated towards the liquid outlet of the retarder pump under the driving of the retarder pump, and small-hole throttling is formed under the limiting action of the orifice, so that the conversion from the kinetic energy of the rotor to the potential energy of the oil pressure and then to the heat energy is realized, and the retarding braking is realized;
the heat exchanger is arranged between the retarder pump and the oil tank, and maintains the temperature of oil to be stable;
in a retarding operation state, the retarding pump pumps oil in the oil tank to be conveyed to the heat exchanger, and finally the oil flows back to the oil tank;
the retarding pump, the auxiliary pump and the oil tank are connected through pipelines;
in an unloading state, the auxiliary pump pumps oil liquid remained in the retarding pump to the oil tank;
in an idle state, the liquid inlet of the retarding pump is cut off from the oil tank; the auxiliary pump conveys oil in the oil tank to the retarder pump, and the retarder pump is lubricated to reduce frictional resistance in the running process of the retarder pump.
In an alternative embodiment, the oil tank is filled with oil capable of sealing at least 0.08mm gap; the slow speed pump 2 is a rotor pump, and a floating valve plate is arranged between two ends of a rotor and the shell.
In an optional embodiment, the operating temperature of the oil in the retarder pump is forty degrees celsius below zero to one hundred sixty degrees celsius above zero.
In an alternative embodiment, the retarder pump includes a seal housing, a stator, and a rotor; a sealing cavity is arranged in the sealing shell, the rotor and the stator are arranged in the sealing cavity, a working cavity is formed between the rotor and the stator, and the pressure in the working cavity changes in the rotation process of the rotor to drive oil to flow; the rotor is cycloidal, blade type or planetary.
In an alternative embodiment, the retarder pump further comprises a first control valve;
the first control valve is connected with the sealing shell through a pipeline, and when the first control valve is opened, a sealing cavity in the sealing shell is communicated with the outside air; when the first control valve is closed, the sealing cavity in the sealing shell is isolated from the outside air;
in a slow speed operation state, the first control valve is closed; and in the unloading state and the no-load state, the first control valve is opened.
In an alternative embodiment, a second control valve is arranged between the auxiliary pump and the retarding pump or between the auxiliary pump and the oil tank; a third control valve is arranged between the retarder pump and the heat exchanger; the auxiliary pump is a bidirectional pump;
in a slow speed operation state, the second control valve is closed, and the third control valve is opened; and in the unloading state and the no-load state, the second control valve is opened, and the third control valve is closed.
In an optional embodiment, a porous plate and a fourth control valve are arranged at the liquid outlet of the speed reducing pump; the fourth control valve adjusts the pressure in the working cavity by adjusting the opening size of the through hole in the porous plate, so that the retarding braking force is controlled.
In an alternative embodiment, the oil tank is provided with a safety valve, the safety valve is a one-way valve which flows into the oil tank, and the safety valve connects an inner cavity of the oil tank with outside air.
In an optional embodiment, an unloading pipeline is arranged outside the retarder pump, the unloading pipeline is connected with a liquid inlet and a liquid outlet of the retarder pump, an unloading valve is arranged on the unloading pipeline, the liquid inlet and the liquid outlet of the retarder pump are communicated when the unloading valve is opened, and the liquid inlet and the liquid outlet of the retarder pump are disconnected when the unloading valve is closed;
in a slow speed operation state, the unloading valve is closed; and in an unloading state and an unloaded state, the unloading valve is opened.
A vehicle transmission system comprising at least a retarder system and a gear set as hereinbefore described;
the retarding pump is in transmission connection with a gearbox of a vehicle to be installed through the gear set, and the gear set is a speed-increasing torque-reducing gear set.
The utility model has the beneficial effects that:
the utility model provides a retarder system, comprising: the system comprises an oil tank, a retarding pump, an auxiliary pump and a heat exchanger; oil liquid is stored in the oil tank; the speed reducing pump is a rotor pump, a rotor is arranged in the speed reducing pump, the rotor is connected with a part to be subjected to speed reducing, and the part to be subjected to speed reducing drives the rotor to rotate; the speed reducing pump is connected with an oil tank pipeline, and oil circularly flows between the speed reducing pump and the oil tank; an orifice is arranged at the liquid outlet of the retarder pump, when the retarder pump pumps oil, the oil is gradually accumulated towards the liquid outlet of the retarder pump under the driving of the retarder pump, and small-hole throttling is formed under the limiting action of the orifice, so that the conversion from the kinetic energy of the rotor to the potential energy of the oil pressure and then to the heat energy is realized, and the retarding braking is realized; the heat exchanger is arranged between the retarder pump and the oil tank, and maintains the temperature of oil to be stable; in a retarding operation state, the retarding pump pumps oil in the oil tank to be conveyed to the heat exchanger and finally flows back to the oil tank; the retarding pump, the auxiliary pump and the oil tank are connected through pipelines; in an unloading state, the auxiliary pump pumps oil liquid remained in the retarding pump to the oil tank; in an idle state, the liquid inlet of the retarding pump is cut off from the oil tank; the auxiliary pump conveys oil in the oil tank to the retarder pump, and the retarder pump is lubricated to reduce frictional resistance in the running process of the retarder pump.
According to the retarder system, the rotor drives the liquid to flow, so that the liquid is in relative friction with the rotor and the stator, and partial mechanical energy is converted into heat energy to achieve a retarding effect; when need not the slow speed, the inlet of slow speed pump with the oil tank cuts, the slow speed pump stops the suction oil tank in the oil tank idles, the auxiliary pump extraction fluid in the oil tank is right the slow speed pump lubricates, reduces the frictional resistance that the rotor rotated the in-process and received. By adopting the retarder system provided by the utility model, an electromagnetic induction device is not required to be additionally arranged for braking, the retarder pump is directly connected with a component to be retarded, the structure is simple, and the whole weight is light; in addition, the components of the retarder system provided by the utility model are directly connected through pipelines, the components can be reasonably arranged according to requirements during installation, the overall structure is more compact, the required use space is effectively reduced, and the retarder system has obvious advantages compared with similar products.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a retarding system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a retarding system according to an embodiment of the present invention in a retarding operation state;
FIG. 3 is a schematic structural diagram of a retarder system according to an embodiment of the present invention in an unloading state;
fig. 4 is a schematic structural diagram of a retarder system in an unloaded state according to an embodiment of the present invention.
Icon: 1-an oil tank; 2-a slow speed pump; 3-an auxiliary pump; 4-a heat exchanger; 5-an unloading valve; 6-a perforated plate; 7-safety valve.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and detailed description, and the embodiments and features of the embodiments of the present application may be combined with each other without conflict. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1 to 4, an embodiment of the present invention provides a retarder system including: the system comprises an oil tank 1, a retarding pump 2, an auxiliary pump 3 and a heat exchanger 4;
oil liquid is stored in the oil tank 1;
the speed reducing pump 2 is a rotor pump, a rotor is arranged in the speed reducing pump 2 and is connected with a part to be reduced, and the part to be reduced drives the rotor to rotate; the retarder pump 2 is connected with the oil tank 1 through a pipeline, and oil circularly flows between the retarder pump 2 and the oil tank 1; an orifice is arranged at the liquid outlet of the retarder pump 2, when the retarder pump 2 pumps oil, the oil is gradually accumulated towards the liquid outlet of the retarder pump 2 under the driving of the retarder pump 2, and small-hole throttling is formed under the limiting action of the orifice, so that the conversion from the kinetic energy of the rotor to the potential energy of the oil pressure and then to the heat energy is realized, and the retarding braking is realized;
the heat exchanger 4 is arranged between the retarder pump 2 and the oil tank 1, and maintains the temperature of oil liquid to be stable;
in a retarding operation state, the retarding pump 2 pumps oil in the oil tank 1 and conveys the oil to the heat exchanger 4, and finally the oil flows back to the oil tank 1;
the retarding pump 2, the auxiliary pump 3 and the oil tank 1 are connected through pipelines;
in an unloading state, the auxiliary pump 3 pumps oil liquid remaining in the retarder pump 2 to the oil tank 1;
in an idle state, the liquid inlet of the retarding pump 2 is cut off from the oil tank 1; the auxiliary pump 3 conveys oil in the oil tank 1 to the retarder pump 2, and the retarder pump 2 is lubricated to reduce the friction resistance of the retarder pump 2 in the running process.
According to the retarder system, the rotor drives the liquid to flow, so that the liquid and the rotor and the stator generate relative friction, and partial mechanical energy is converted into heat energy to achieve a retarding effect; when need not the slow speed, the inlet of slow speed pump 2 with oil tank 1 cuts, slow speed pump 2 stops the suction oil tank 1 in the oil tank 1 carries out the idle running, supplementary pump 3 extracts fluid in the oil tank 1 is right slow speed pump 2 lubricates, reduces the frictional resistance that the rotor rotated the in-process and received. By adopting the retarder system provided by the utility model, an electromagnetic induction device is not required to be additionally arranged for braking, the retarder pump 2 is directly connected with a component to be retarded, the structure is simple, and the whole weight is light; in addition, the components of the retarder system provided by the utility model are directly connected through pipelines, the components can be reasonably arranged according to requirements during installation, the overall structure is more compact, the required use space is effectively reduced, and the retarder system has obvious advantages compared with similar products. The utility model provides a retarder which is low in cost and can meet the requirements on performance, and can meet the requirements on various conditions of slowing down a long slope under a vehicle, so that the vehicle can run safely.
As an optional embodiment of the present invention, an unloading pipeline is disposed outside the retarder pump 2, the unloading pipeline is connected to a liquid inlet and a liquid outlet of the retarder pump 2, an unloading valve 5 is disposed on the unloading pipeline, the liquid inlet and the liquid outlet of the retarder pump 2 are communicated when the unloading valve 5 is opened, and the liquid inlet and the liquid outlet of the retarder pump 2 are disconnected when the unloading valve 5 is closed.
Specifically, in the slow operation state, the unloading valve 5 is closed; in the unloaded state and in the unloaded state, the unloading valve 5 is open.
As an alternative embodiment of the utility model, the oil tank 1 is filled with engine oil capable of sealing at least 0.08mm gap; the slow speed pump 2 is a rotor pump, and a floating valve plate is arranged between the two ends of a rotor and the shell; the working temperature of the oil in the retarder pump 2 is from forty degrees centigrade below zero to one hundred sixty degrees centigrade above zero.
Specifically, the used engine oil has enough fluidity at low temperature and high-temperature viscosity within the working temperature of forty ℃ below zero to one hundred sixty ℃ above zero, can seal end gaps and meshing gaps of more than 0.08mm, has proper flow resistance and is convenient for heat dissipation.
As an alternative embodiment of the present invention, the retarder pump 2 includes a seal housing, a stator, and a rotor; a sealing cavity is arranged in the sealing shell, the rotor and the stator are arranged in the sealing cavity, a working cavity is formed between the rotor and the stator, and the pressure in the working cavity changes in the rotation process of the rotor to drive oil to flow; the rotor is cycloidal, blade type or planetary.
As an alternative embodiment of the present invention, the retarder pump 2 further includes a first control valve; the first control valve is connected with the sealing shell through a pipeline, and when the first control valve is opened, a sealing cavity in the sealing shell is communicated with the outside air; when the first control valve is closed, the sealing cavity in the sealing shell is isolated from the outside air; in a slow speed operation state, the first control valve is closed; and in the unloading state and the no-load state, the first control valve is opened.
A second control valve is arranged between the auxiliary pump 3 and the retarding pump 2 or between the auxiliary pump 3 and the oil tank 1; a third control valve is arranged between the retarder pump 2 and the heat exchanger 4; the auxiliary pump 3 is a bidirectional pump; in a slow speed operation state, the second control valve is closed, and the third control valve is opened; and in the unloading state and the no-load state, the second control valve is opened, and the third control valve is closed.
Specifically, the first control valve, the second control valve and the third control valve are electromagnetic valves, wherein the opening and closing states of the control valves are relatively fixed under different working states of the retarder system, and an additional control circuit can be arranged to uniformly regulate and control local control valves or all control valves.
Specifically, the first control valve, the second control valve, and the third control valve are pressure control valves, the replica pump is a bidirectional variable pressure pump, and the operating state of the buffer system is switched by adjusting the output direction and the output pressure of the auxiliary pump 3 to adjust the open/close state of each control valve.
As an optional embodiment of the present invention, a perforated plate 6 and a fourth control valve are disposed at the liquid outlet of the retarder pump 2; the fourth control valve adjusts the pressure in the working cavity by adjusting the opening size of the through hole in the porous plate 6, so that the retarding braking force is controlled.
As an optional embodiment of the present invention, a safety valve 7 is disposed on the oil tank 1, the safety valve 7 is a one-way valve flowing into the direction of the oil tank 1, the safety valve 7 communicates an inner cavity of the oil tank 1 with outside air, so as to prevent the oil tank 1 from being emptied due to untimely oil return or local pipeline blockage, which causes secondary damage to the buffer system, and the safety of the buffer system can be effectively improved by adding the safety valve 7.
Specifically, the safety valve 7 is arranged at the bottom of the oil tank 1; the pressure at the bottom of the oil tank 1 is high, oil liquid has a tendency of flowing out of the oil tank 1, after the air suction condition occurs in the oil tank 1, the safety valve 7 is opened, outside air is introduced, the safety valve 7 is closed as a one-way valve by automatic pressing under the action of oil hydraulic pressure after the air suction condition is improved, and the safety valve 7 is arranged at the bottom of the oil tank 1 and is convenient for the safety valve 7 to be closed by resetting in time. In addition, the safety valve 7 is arranged at the bottom of the oil tank 1, when the air suction strength is small, the safety valve 7 keeps a closed state under the pressure of the oil, the safety valve 7 is opened only after the air suction strength is larger than the pressure at the bottom of the oil, and external air is introduced, namely the safety valve 7 is arranged at the bottom of the oil tank 1, so that the safety valve 7 can be effectively prevented from being frequently opened, and the internal working state of the retarder system is effectively maintained to be relatively stable.
A vehicle transmission system comprising at least a retarder system and a gear set as hereinbefore described;
the retarding pump 2 is in transmission connection with a gearbox of a vehicle to be installed through the gear set, and the gear set is a speed-increasing torque-reducing gear set.
Specifically, the retarder system and the vehicle gearbox can be installed in a series or parallel mode in a combined mode.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A retarder system, comprising: the system comprises an oil tank (1), a retarding pump (2), an auxiliary pump (3) and a heat exchanger (4);
oil liquid is stored in the oil tank (1);
the speed reducing pump (2) is a rotor pump, a rotor is arranged in the speed reducing pump (2), the rotor is connected with a part to be subjected to speed reducing, and the part to be subjected to speed reducing drives the rotor to rotate; the retarding pump (2) is connected with the oil tank (1) through a pipeline, and oil circularly flows between the retarding pump (2) and the oil tank (1); a throttling hole is formed in the liquid outlet of the retarder pump (2), when the retarder pump (2) pumps oil, the oil is gradually accumulated towards the liquid outlet of the retarder pump (2) under the driving of the retarder pump (2), small hole throttling is formed under the limiting action of the throttling hole, the conversion from the kinetic energy of the rotor to the potential energy of the oil liquid and then to the heat energy is realized, and the retarding braking is realized;
the heat exchanger (4) is arranged between the retarder pump (2) and the oil tank (1) to maintain the temperature of oil to be stable;
in a retarding operation state, the retarding pump (2) pumps oil in the oil tank (1) and conveys the oil to the heat exchanger (4), and finally the oil flows back to the oil tank (1);
the retarding pump (2), the auxiliary pump (3) and the oil tank (1) are connected through pipelines;
in an unloading state, the auxiliary pump (3) pumps oil liquid remaining in the retarding pump (2) to the oil tank (1);
in an idle load state, the liquid inlet of the retarding pump (2) is cut off from the oil tank (1); the auxiliary pump (3) conveys oil in the oil tank (1) to the retarder pump (2), and the retarder pump (2) is lubricated to reduce frictional resistance in the running process of the retarder pump (2).
2. A retarder system according to claim 1, characterised in that the oil tank (1) contains oil which seals at least a 0.08mm gap, the retarder pump (2) is a rotor pump, and a floating port plate is provided between the rotor ends and the housing.
3. The retarder system of claim 1, wherein the operating temperature of the oil in the retarder pump (2) is between-forty degrees celsius and-one hundred sixty degrees celsius.
4. The retarder system according to claim 1, characterized in that the retarder pump (2) comprises a sealed housing, a stator and a rotor; a sealing cavity is arranged in the sealing shell, the rotor and the stator are arranged in the sealing cavity, a working cavity is formed between the rotor and the stator, and the pressure in the working cavity changes in the rotation process of the rotor to drive oil to flow; the rotor is cycloidal, blade type or planetary.
5. The retarder system of claim 4, characterized in that the retarder pump (2) further comprises a first control valve;
the first control valve is connected with the sealing shell through a pipeline, and when the first control valve is opened, a sealing cavity in the sealing shell is communicated with the outside air; when the first control valve is closed, the sealing cavity in the sealing shell is isolated from the outside air;
in a speed-reducing operation state, the first control valve is closed; and in the unloading state and the no-load state, the first control valve is opened.
6. A retarder system according to claim 1, characterised in that a second control valve is arranged between the auxiliary pump (3) and the retarder pump (2), or between the auxiliary pump (3) and the oil tank (1); a third control valve is arranged between the retarder pump (2) and the heat exchanger (4); the auxiliary pump (3) is a bidirectional pump;
in a slow speed operation state, the second control valve is closed, and the third control valve is opened; and in the unloading state and the no-load state, the second control valve is opened, and the third control valve is closed.
7. A retarder system according to claim 4, characterized in that a perforated plate (6) and a fourth control valve are arranged at the outlet of the retarder pump (2); the fourth control valve adjusts the pressure in the working cavity by adjusting the opening size of the through hole in the porous plate (6), so that the retarding braking force is controlled.
8. A retarder system according to claim 1, characterised in that a safety valve (7) is arranged on the oil tank (1), which safety valve (7) is a one-way valve that flows in the direction of the oil tank (1), which safety valve (7) connects the inner cavity of the oil tank (1) with the outside air.
9. The retarder system according to claim 1, wherein an unloading pipeline is arranged outside the retarder pump (2), the unloading pipeline is connected with a liquid inlet and a liquid outlet of the retarder pump (2), an unloading valve (5) is arranged on the unloading pipeline, the liquid inlet and the liquid outlet of the retarder pump (2) are communicated when the unloading valve (5) is opened, and the liquid inlet and the liquid outlet of the retarder pump (2) are disconnected when the unloading valve (5) is closed;
in the slow speed operation state, the unloading valve (5) is closed; in the unloading state and the no-load state, the unloading valve (5) is opened.
10. A vehicle transmission system comprising at least a retarder system according to any of claims 1-9 and a gear set;
the retarding pump (2) is in transmission connection with a gearbox of a vehicle to be installed through the gear set, and the gear set is a speed-increasing and torque-reducing gear set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123438657.0U CN216867355U (en) | 2021-12-31 | 2021-12-31 | Retarder system and vehicle transmission system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123438657.0U CN216867355U (en) | 2021-12-31 | 2021-12-31 | Retarder system and vehicle transmission system thereof |
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| Publication Number | Publication Date |
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| CN216867355U true CN216867355U (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123438657.0U Active CN216867355U (en) | 2021-12-31 | 2021-12-31 | Retarder system and vehicle transmission system thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN216867355U (en) |
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2021
- 2021-12-31 CN CN202123438657.0U patent/CN216867355U/en active Active
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