A self-contained, series hydraulic retarder

Abstract

The application discloses an independently installed series hydraulic retarder, and solves the problems of high matching difficulty, high failure rate, difficult maintenance and high cost of the existing series retarder and gearbox, and comprises a retarder assembly, an independently installed component, a retarder input flange and a retarder output flange, wherein the retarder assembly comprises a working cavity assembly, and the working cavity assembly has a hollow shaft penetrating through the center thereof; the independently installed component comprises a bearing seat, a bearing, a retarder transmission shaft and an oil seal seat; the bearing is nested in the bearing seat and the two are in transition fit, and the bearing is sleeved on the retarder transmission shaft and the two are in interference fit; one end of the bearing seat is connected with the oil seal seat, and the other end is connected with the shell of the retarder; the power input end of the retarder transmission shaft penetrates through the inner cavity of the oil seal seat and is connected with the retarder input flange through spline connection, the power output end of the retarder transmission shaft penetrates through the hollow shaft and is connected with the retarder output flange through spline connection, and the retarder transmission shaft is connected with the hollow shaft through spline connection.

Description

Technical Field

[0001] This invention relates to a series hydraulic retarder, and more specifically to a separately installed series hydraulic retarder. Background Technology

[0002] With the increasing popularity of hydraulic retarders in the commercial vehicle industry, they have become standard equipment. The working principle of a hydraulic retarder is to control the air pressure to force the oil stored in the retarder's oil sump into the working chamber through the oil passage, thereby generating braking torque through the stator and rotor structure, thus slowing down the entire vehicle.

[0003] Existing tandem hydraulic retarders typically include a working chamber, oil sump, and heat exchanger, and are assembled at the rear of the transmission, forming a single unit. However, this requires an additional rear auxiliary gearbox, an extended output shaft, and additional components. The transmission output shaft passes through the hollow shaft of the tandem hydraulic retarder's working chamber and is then secured with a flange. The retarder housing is then directly or via a transition bracket to the transmission's rear cover. Only after the hydraulic retarder and transmission are integrated can it be mounted on the vehicle's drivetrain for power transmission. Therefore, existing tandem hydraulic retarders require connecting mechanisms to connect to the transmission.

[0004] For example, Chinese utility model patent CN219692212U discloses a matching connection mechanism for a small torque series retarder, including an extended auxiliary gearbox main shaft, a connecting bracket for the small torque series retarder and the gearbox, a hollow shaft of the series retarder, and an extended output flange of the series retarder, all passing sequentially through the extended auxiliary gearbox main shaft. A flange insert is mounted on the extended auxiliary gearbox main shaft, located behind the sealing O-ring and fitted with a flange nut. The distance between the flange end face and the series retarder housing is extended, as is the distance between the flange rear end face and the retarder housing, allowing for easy insertion and tightening of bolts with a wrench. This provides more operational space for assembling the flange and drive shaft connecting bolts during vehicle installation, solving the problem of applying small torque series retarders to medium and light trucks. However, it still requires a connecting mechanism to connect with the gearbox and necessitates the installation of an extended auxiliary gearbox main shaft, altering the existing gearbox structure.

[0005] Therefore, existing tandem hydraulic retarders require the addition of a rear auxiliary box after the transmission to be compatible with it. This necessitates structural modifications to the transmission and the design of matching connection mechanisms for different transmission models. However, the wide variety of transmission models and the numerous resulting variations in configurations lead to high investment costs and various component failure modes arising from the retarder itself. Consequently, existing tandem retarders are difficult to match with transmissions, have a high failure rate, are difficult to repair, have high maintenance costs, and may potentially reduce transmission reliability. Summary of the Invention

[0006] The purpose of this invention is to solve the technical problems of existing series hydraulic retarders being difficult to match with the gearbox, having a high failure rate, being difficult to maintain, having high maintenance costs, and potentially causing a decrease in the reliability of the gearbox, and to provide an independently installed series hydraulic retarder.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A self-installed series hydraulic retarder includes a retarder assembly, which includes a working chamber assembly, which includes a retarder housing and a hollow shaft passing through the center of the retarder housing. The retarder ...

[0009] The independently mounted components include bearing housings, bearings, retarder drive shafts, and oil seal housings;

[0010] The bearing is nested in the bearing housing and the two are transitionally fitted. The bearing is sleeved on the retarder drive shaft and the two are interference-fitted.

[0011] One end of the bearing housing is fixedly connected to the oil seal seat, and the other end is fixedly connected to the retarder housing;

[0012] The power input end of the retarder drive shaft passes through the inner cavity of the oil seal seat and is splinedly connected to the retarder input flange. The power output end of the retarder drive shaft passes through the hollow shaft and is splinedly connected to the retarder output flange. The retarder drive shaft and the hollow shaft are connected by a spline.

[0013] Furthermore, the retarder assembly also includes a heat exchanger;

[0014] The heat exchanger has a relatively independent first heat exchange circuit and a second heat exchange circuit. The first heat exchange circuit is used to cool the oil in the working chamber assembly, and the second heat exchange circuit is used to cool the oil in the independently mounted assembly.

[0015] The bearing housing has an oil inlet and an oil outlet on its circumferential sidewall. An oil groove is provided on the inner wall of the bearing housing along its axial direction. The oil inlet and the oil outlet are both connected to the oil groove.

[0016] The bearing housing oil inlet is connected to the outlet of the second heat exchange circuit via an oil pump, and the bearing housing oil outlet is connected to the inlet of the second heat exchange circuit.

[0017] Furthermore, a first oil seal is nested inside the oil seal seat, and an oil seal mounting protrusion ring for limiting the first oil seal is provided on the inner wall surface of the oil seal seat. An oil seal oil passage groove is provided on the inner wall of the oil seal seat stop of the oil seal seat, and the oil seal oil passage groove is in communication with the oil passage groove of the bearing seat.

[0018] Furthermore, the retarder assembly also includes an oil sump, the first oil outlet of the oil sump is connected to the first oil inlet of the working chamber assembly, the first oil outlet of the working chamber assembly is connected to the oil inlet of the first heat exchange circuit through a first one-way valve, and the oil outlet of the first heat exchange circuit is connected to the first oil inlet of the working chamber assembly and the oil inlet of the oil sump respectively.

[0019] Furthermore, the second oil outlet of the oil tank is connected to the second oil inlet of the working chamber assembly, and the second oil outlet of the working chamber assembly is connected to the oil inlet of the first heat exchange circuit through a second one-way valve.

[0020] Furthermore, the bearing housing has a limiting boss at one end near the retarder housing, one end of the bearing outer ring abuts against the limiting boss, and the other end of the bearing outer ring is clearance-fitted with the end face of the oil seal seat.

[0021] The retarder drive shaft has a limiting shoulder, one end of the bearing inner ring abuts against the limiting shoulder, and the other end of the bearing inner ring abuts against the end face of the retarder input flange.

[0022] Furthermore, the retarder drive shaft is provided with a first spline, a second spline, and a third spline;

[0023] The retarder input flange is connected to the retarder drive shaft via a first spline, the hollow shaft is connected to the retarder drive shaft via a second spline, and the retarder output flange is connected to the retarder drive shaft via a third spline.

[0024] Furthermore, at the connection between the bearing housing and the oil seal seat, the oil seal seat has a protruding end that extends into the inner cavity of the bearing housing, forming an overlap between the bearing housing and the oil seal seat, and a first O-ring seal is provided at the overlap.

[0025] Furthermore, the bearing housing has a stop that matches the size of the retarder housing. A second O-ring is provided on the outer ring of the stop, and an oil seal mounting hole and an axial limiting ring are provided on the inner ring of the stop. A second oil seal is provided in the oil seal mounting hole. The second oil seal is axially limited between the bearing housing and the retarder housing by the axial limiting ring. The outer ring of the second oil seal is interference-fitted with the oil seal mounting hole, and the inner ring of the second oil seal is sleeved on the outer wall of the hollow shaft.

[0026] Furthermore, the retarder housing has a mounting interface for a fixing bracket, and the retarder assembly is mounted to the vehicle frame via a fixing bracket connected to the mounting interface for the fixing bracket.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] 1. This invention discloses an independently installed tandem hydraulic retarder. By setting up an independent mounting component, and respectively setting a retarder input flange and a retarder output flange at both ends of the retarder drive shaft of the independent mounting component, it can be freed from the constraints of the gearbox. The gearbox maintains its basic shape without any changes to the gearbox structure. The hydraulic retarder can be directly assembled between two drive shafts of the vehicle, or between the output flange of the gearbox and the drive shaft, through the two flanges. This achieves the separation of the tandem hydraulic retarder from the gearbox, simplifying assembly and maintenance. The vehicle does not need to change the gearbox structure to match the tandem hydraulic retarder, reducing matching costs and difficulties. During assembly and maintenance, only the retarder input flange and the retarder output flange need to be connected or disconnected.

[0029] 2. This invention provides an independently installed series hydraulic retarder. The independently installed component utilizes the heat exchanger of the retarder assembly for lubrication and cooling, resulting in a simple structure and high reliability. Furthermore, by independently setting a first heat exchange circuit and a second heat exchange circuit within the heat exchanger, the oil layers are separated and not interconnected, allowing for heat exchange and cooling of the oil in the two modules respectively. This separate cooling of the independently installed component and the hydraulic retarder ensures no interference and high safety.

[0030] 3. The present invention provides an independently installed series hydraulic retarder, with an independently installed component, which is applicable to various existing models of series hydraulic retarders, enabling them to be directly matched and applied.

[0031] 4. The present invention provides an independently installed series hydraulic retarder, with the retarder input flange and retarder output flange designed independently, making installation, maintenance and disassembly easy, and the end face structure of the flange can be diversified to meet the assembly requirements of different vehicle drive shafts.

[0032] 5. The present invention provides an independently installed series hydraulic retarder, wherein the retarder housing has a mounting interface for fixing the retarder to be fixedly installed on the vehicle frame. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structural principle of an embodiment of an independently installed series hydraulic retarder of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the independently installed components and the retarder input flange in an embodiment of an independently installed series hydraulic retarder of the present invention;

[0035] Figure 3 This is a cross-sectional structural diagram of an embodiment of a independently installed series hydraulic retarder according to the present invention;

[0036] Figure 4 This is a cross-sectional view of the bearing housing of an embodiment of a independently installed series hydraulic retarder according to the present invention;

[0037] Figure 5 This is a front view of the bearing housing of an embodiment of a independently installed series hydraulic retarder according to the present invention;

[0038] Figure 6 This is a cross-sectional view of the oil seal seat of an embodiment of a independently installed series hydraulic retarder according to the present invention;

[0039] Figure 7 This is a front view of the oil seal seat of an embodiment of a independently installed series hydraulic retarder according to the present invention.

[0040] The annotations in the attached figures are explained as follows:

[0041] 1. Retarder input flange; 2. Retarder output flange; 3. Independent mounting assembly; 31. First oil seal; 32. First O-ring seal; 33. Second O-ring seal; 34. Second oil seal; 35. Bearing; 36. Retarder drive shaft; 37. Bearing housing; 371. Bearing housing oil inlet; 372. Bearing housing oil outlet; 373. Bearing housing first mounting end face; 374. Bearing housing second mounting end face; 375. Bearing housing oil groove; 376. Axial limiting ring; 377. Limiting boss; 38. Oil seal seat; 381. Oil seal seat mounting end face; 382. Bearing limiting end face; 383. First O-ring seal mounting groove; 384. First oil seal fitting; 385. Labyrinth lip; 386. Oil seal seat stop; 387. Oil seal oil passage groove; 39. Pressure plate; 310. Flange nut; 311. Flange end face O-ring; 4. Working chamber assembly; 5. Stator; 6. Rotor; 7. Oil sump; 8. Heat exchanger; 9. Second check valve; 10. First check valve; 11. First oil outlet of oil sump; 12. Oil inlet of retarder working chamber; 13. First oil outlet of retarder working chamber; 14. Oil outlet of heat exchanger; 15. Second oil outlet of oil sump; 16. Second oil outlet of retarder working chamber; 17. Oil inlet of independent mounting component; 18. Oil outlet of independent mounting component; 19. Oil return path of oil sump; 20. Oil pump; 21. Retarder assembly. Detailed Implementation

[0042] To make the objectives, advantages, and features of the present invention clearer, the following detailed description of an independently installed series hydraulic retarder proposed by the present invention is provided in conjunction with the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0043] like Figure 1-7As shown, in order to enable the hydraulic retarder to be freed from the constraints of the transmission and directly assembled onto the vehicle's transmission system without altering any structure of the transmission, this invention designs an independently installed series hydraulic retarder, including a retarder assembly 21, an independently mounted component 3, a retarder input flange 1, and a retarder output flange 2; the independently mounted component 3 includes a bearing housing 37, a bearing 35, a retarder drive shaft 36, and an oil seal seat 38.

[0044] The retarder assembly 21 includes a working chamber assembly 4, a heat exchanger 8, and an oil sump 7; the working chamber assembly 4 includes a retarder housing, a stator 5, a rotor 6, and a hollow shaft passing through the center of the retarder housing.

[0045] The bearing housing 37 has an inner cavity for assembling the bearing 35, and the inner cavity of the bearing housing is transitionally fitted with the outer ring of the bearing 35. The bearing housing 37 has a stop that is adapted to the size of the retarder housing. A second O-ring seal 33 is provided on the outer ring of the stop to achieve radial sealing between the bearing housing 37 and the retarder housing. The inner ring of the stop is provided with an oil seal mounting hole and an axial limiting ring 376. A second oil seal 34 is provided in the oil seal mounting hole. The second oil seal 34 is axially limited between the bearing housing 37 and the retarder housing by the axial limiting ring 376. The outer ring of the second oil seal 34 is interference-fitted with the oil seal mounting hole to assemble and limit the second oil seal 34. The inner ring of the second oil seal 34 is sleeved on the outer wall of the hollow shaft to achieve radial sealing between the bearing housing 37 and the hollow shaft. The bearing housing 37 has a limiting boss 377 at one end near the retarder housing. One end of the outer ring of the bearing 35 abuts against the limiting boss 377, fixing one side of the bearing outer ring. The other end of the bearing outer ring has a small gap with the bearing limiting end face 382 of the oil seal seat 38 to prevent excessive movement of the bearing outer ring. The bearing 35 can only move axially within the designed bearing clearance range. The inner ring of the bearing 35 is interference-fitted with the retarder drive shaft 36. The retarder drive shaft 36 has a limiting shoulder. One end of the inner ring of the bearing 35 abuts against the limiting shoulder, and the other end abuts against the end face of the retarder input flange 1, forming a tight fit. One end of the bearing housing 37 has a first mounting end face 373 with bolt holes. The bearing housing 37 is fixedly mounted on the retarder housing with bolts. The bearing housing 37 has a bolt hole on its second mounting end face 374. The bearing housing 37 is connected to the oil seal seat 38 by bolts, and the oil seal seat 38 can be fixedly installed on the bearing housing 37. The bearing housing 37 has an oil inlet 371 and an oil outlet 372 on its circumferential side wall. The bearing housing 37 has an oil passage groove 375 along its axial direction on its inner wall surface. Both the oil inlet 371 and the oil outlet 372 are connected to the oil passage groove 375.

[0046] The inner cavity of the oil seal seat 38 has an inner wall for assembling the first oil seal 31. The outer ring of the first oil seal 31 is interference-fitted with the inner wall of the oil seal seat 38, and the inner ring of the first oil seal 31 is fitted with the outer ring of one end of the retarder input flange 1 to achieve radial sealing of the retarder input flange 1. The outer ring circumferential wall of the oil seal seat 38 has an oil seal seat mounting end face 381 that mates with the second mounting end face 374 of the bearing housing and an oil seal seat stop 386 that inserts into the bearing housing 37. The protruding end of the oil seal seat stop 386 extends into the inner cavity of the bearing housing 37, forming an overlap between the bearing housing 37 and the oil seal seat 38. The oil seal seat 38 has a first O-ring seal mounting groove 383 at the overlap, and a first O-ring seal 32 is installed in the first O-ring seal mounting groove 383 to achieve radial sealing between the bearing housing 37 and the oil seal seat 38. After the oil seal seat 38 is connected to the bearing housing 37, the gap between the bearing limiting end face 382 of the oil seal seat 38 and the outer ring end face of the bearing 35 is small, which prevents the bearing from axially transitioning to the retarder input flange 1 side. The end of the oil seal seat 38 away from the bearing housing 37 has a labyrinth lip 385, which forms a labyrinth with the corresponding part of the retarder input flange 1, serving as a dustproof and waterproof function. The inner wall of the oil seal seat 38 has an oil seal mounting protrusion ring that limits the first oil seal 31. The inner wall of the oil seal seat stop 386 of the oil seal seat 38 has an oil seal oil passage groove 387. The oil seal oil passage groove 387 is connected to the bearing seat oil passage groove 375, and can pass lubricating oil to achieve the purpose of lubricating the first oil seal 31.

[0047] The bearing 35 is pressed onto the retarder drive shaft 36, and then pressed together into the bearing housing 37. One end of the outer ring of the bearing 35 is pressed firmly against the limiting boss 377. Then, the second O-ring seal 33 is installed at the stop of the bearing housing 37, and the second oil seal 34 is pressed into the oil seal mounting position of the axial limiting ring 376 and tightened. The first O-ring seal 32 is installed in the first O-ring seal mounting groove 383, and then the first oil seal 31 is pressed into the first oil seal fitting 384 on the inner circumferential side wall of the oil seal seat 38.

[0048] After completing the above operations, insert the oil seal seat stop 386 into the bearing seat 37, align the second mounting end face 374 of the bearing seat with the mounting end face 381 of the oil seal seat and tighten with bolts; then put the retarder input flange 1 on the retarder drive shaft 36, and the two are connected by a spline (i.e., the first spline). Assemble the O-ring 311, pressure plate 39 and flange nut 310 on the flange end face and tighten the flange nut 310.

[0049] Then, the retarder drive shaft 36 is passed through the hollow shaft, and the two are engaged by a spline (i.e., the second spline). The independent mounting assembly is then fixedly assembled onto the retarder housing via the first mounting end face 373 of the bearing seat. Next, the retarder output flange 2 is assembled, and the retarder output flange is engaged with the retarder drive shaft 36 by a spline (i.e., the third spline). Then, the O-ring 311, pressure plate 39, and flange nut 310 on the flange end face of the retarder side are assembled and tightened. The retarder drive shaft 36 is connected to the flange at both ends in the same way, achieving tension of the entire retarder drive shaft system. In this embodiment, the second spline and the third spline are the same spline, but they can also be two splines with a gap between them.

[0050] When installing the independently mounted tandem hydraulic retarder provided by this invention into the vehicle's drivetrain, installation is completed simply by connecting the retarder input flange 1 to the vehicle's driveshaft or the gearbox output flange, and the retarder output flange 2 to the vehicle's driveshaft. This allows the retarder to be independent of the gearbox, maintaining its basic configuration without altering any gearbox structure. The hydraulic retarder can be directly mounted between two driveshafts of the vehicle, or between the gearbox's output flange and the driveshaft, using only the two flanges. This achieves separation of the tandem hydraulic retarder from the gearbox, simplifying assembly and maintenance. The vehicle does not require any changes to the gearbox structure to accommodate the tandem hydraulic retarder, reducing matching costs and difficulty. During assembly and maintenance, only the retarder input flange and retarder output flange need to be connected or disconnected.

[0051] The heat exchanger 8 has two separate oil channels, forming a first heat exchange loop and a second heat exchange loop. The first heat exchange loop is used to cool the oil in the working chamber assembly 4, and the second heat exchange loop is used to cool the oil in the independent mounting component 3. The independent mounting component and the retarder assembly 21 share a heat exchanger 8. Based on the original heat exchanger, a circulating oil cooling layer for lubrication and cooling of the independent mounting component is added. The oil layers are separated and do not communicate with each other, exchanging heat and cooling the oil in the working chamber assembly 4 and the independent mounting component 3 respectively.

[0052] The bearing housing oil inlet 371 is connected to the outlet of the second heat exchange circuit via the oil pump 20, forming an independent mounting component oil inlet 17. The bearing housing oil outlet 372 is connected to the inlet of the second heat exchange circuit, forming an independent mounting component oil outlet 18.

[0053] The first oil outlet of the oil sump 7 is connected to the first oil inlet of the working chamber assembly 4, forming the first oil outlet path 11 of the oil sump and the oil inlet path 12 of the retarder working chamber. The first oil outlet of the working chamber assembly 4 is connected to the oil inlet of the first heat exchange circuit through the first check valve 10, forming the first oil outlet path 13 of the retarder working chamber. The oil outlet of the first heat exchange circuit is connected to the oil inlet of the oil sump 7 and the first oil inlet of the working chamber assembly 4, respectively, forming the heat exchanger oil outlet path 14, the oil return path 19 of the oil sump and the oil inlet path 12 of the retarder working chamber.

[0054] The second oil outlet of the oil sump 7 is connected to the second oil inlet of the working chamber assembly 4 to form the second oil outlet path 15 of the oil sump. The second oil outlet of the working chamber assembly 4 is connected to the oil inlet of the first heat exchange circuit through the second one-way valve 9 to form the second oil outlet path 16 of the retarder working chamber.

[0055] The retarder housing has a mounting bracket interface, and the retarder assembly 21 is mounted to the vehicle frame via a mounting bracket connected to the mounting bracket interface.

[0056] The rotation of the front drive shaft or gearbox output flange of the vehicle drives the input flange 1 of the retarder to rotate, and the retarder drive shaft 36 rotates along with it, thereby transmitting power to the output flange 2 of the retarder and the rear drive shaft of the vehicle.

[0057] When the hydraulic retarder is working: compressed gas enters the oil sump 7, and oil enters the working chamber assembly 4 from the first oil outlet 11 of the oil sump and the oil inlet 12 of the retarder working chamber. The rotor 6 agitates the working medium (i.e., oil) in the working chamber assembly 4, generating an interaction force with the stator 5, producing the retarder braking torque, which is transmitted to the rear drive shaft of the vehicle through the retarder drive shaft 36 and the retarder output flange 2, thereby achieving vehicle deceleration. After working, the high-temperature oil enters the heat exchanger 8 from the first oil outlet 13 of the retarder working chamber and the first one-way valve 10 for cooling, and then enters the working chamber assembly 4 through the heat exchanger oil outlet 14 and the oil inlet 12 of the retarder working chamber, thus repeating the cycle. When the hydraulic retarder is out of operation, the oil returns to the oil sump 7 from the oil return oil outlet 19.

[0058] When the hydraulic retarder is not working: as the rotor 6 rotates, there is a certain negative pressure in the working chamber assembly 4. Some of the oil in the oil sump enters the working chamber assembly 4 from the second oil outlet 15 of the oil sump, and then returns to the heat exchanger 8 for cooling from the second oil outlet 16 of the retarder working chamber and the second one-way valve 9. It then returns to the oil sump 7 from the oil return line 19, and so on.

[0059] Lubrication and cooling process of independently mounted component 3:

[0060] Through the action of oil pump 20, oil flows from heat exchanger 8 through oil inlet 17 of independent mounting component and enters the interior of independent mounting component 3 through bearing housing oil inlet 371. It fills the entire interior of independent mounting component 3 through bearing housing oil groove 375 and oil seal oil groove 387, cooling the first oil seal 31, the second oil seal 34 and bearing 35. Then it flows out from bearing housing oil outlet 372 and returns to heat exchanger 8 through independent mounting component oil outlet 18 for heat exchange and cooling, and the cycle repeats.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] In the description of this invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A series hydraulic retarder installed independently, comprising a retarder assembly (21), the retarder assembly (21) comprising a working chamber assembly (4), the working chamber assembly (4) comprising a retarder housing and a hollow shaft passing through the center of the retarder housing; characterized in that: Includes independent mounting components (3), retarder input flange (1) and retarder output flange (2); The independently mounted component (3) includes a bearing housing, a bearing, a retarder drive shaft (36), and an oil seal housing (38). The bearing (35) is nested in the bearing housing (37) with a transition fit. The bearing (35) is sleeved on the retarder drive shaft (36) with an interference fit. One end of the bearing housing (37) is fixedly connected to the oil seal housing (38), and the other end is fixedly connected to the retarder housing; The power input end of the retarder drive shaft (36) passes through the inner cavity of the oil seal seat (38) and is splinedly connected to the retarder input flange (1). The power output end of the retarder drive shaft (36) passes through the hollow shaft and is splinedly connected to the retarder output flange (2). The retarder drive shaft (36) and the hollow shaft are splinedly connected. The retarder assembly (21) also includes a heat exchanger (8); The heat exchanger (8) has a relatively independent first heat exchange circuit and a second heat exchange circuit. The first heat exchange circuit is used to cool the oil in the working chamber assembly (4), and the second heat exchange circuit is used to cool the oil in the independent mounting assembly (3). The bearing housing (37) has a bearing housing oil inlet (371) and a bearing housing oil outlet (372) on its circumferential side wall. The bearing housing (37) has a bearing housing oil passage groove (375) arranged along its axial direction on its inner wall surface. The bearing housing oil inlet (371) and the bearing housing oil outlet (372) are both connected to the bearing housing oil passage groove (375). The bearing housing oil inlet (371) is connected to the outlet of the second heat exchange circuit via the oil pump (20), and the bearing housing oil outlet (372) is connected to the inlet of the second heat exchange circuit.

2. The independently installed series hydraulic retarder according to claim 1, characterized in that: The oil seal seat (38) is nested with a first oil seal (31). The inner wall of the oil seal seat (38) has an oil seal mounting protrusion ring that limits the first oil seal (31). An oil seal oil passage groove (387) is opened on the inner wall of the oil seal seat stop (386) of the oil seal seat (38). The oil seal oil passage groove (387) is connected to the bearing seat oil passage groove (375).

3. The independently installed series hydraulic retarder according to claim 1, characterized in that: The retarder assembly (21) also includes an oil sump (7). The first oil outlet of the oil sump (7) is connected to the first oil inlet of the working chamber assembly (4). The first oil outlet of the working chamber assembly (4) is connected to the oil inlet of the first heat exchange circuit through a first check valve (10). The oil outlet of the first heat exchange circuit is connected to the first oil inlet of the working chamber assembly (4) and the oil inlet of the oil sump (7) respectively.

4. The independently installed series hydraulic retarder according to claim 3, characterized in that: The second oil outlet of the oil tank (7) is connected to the second oil inlet of the working chamber assembly (4), and the second oil outlet of the working chamber assembly (4) is connected to the oil inlet of the first heat exchange circuit through the second one-way valve (9).

5. The independently installed series hydraulic retarder according to claim 1, characterized in that: The bearing housing (37) has a limiting boss (377) at one end near the retarder housing. One end of the outer ring of the bearing (35) abuts against the limiting boss (377), and the other end of the outer ring of the bearing (35) is clearance-fitted with the end face of the oil seal seat (38). The retarder drive shaft (36) has a limiting shoulder, one end of the inner ring of the bearing (35) abuts against the limiting shoulder, and the other end of the inner ring of the bearing (35) abuts against the end face of the retarder input flange (1).

6. The independently installed series hydraulic retarder according to claim 5, characterized in that: The retarder drive shaft (36) is provided with a first spline, a second spline and a third spline; The retarder input flange (1) is connected to the retarder drive shaft (36) via a first spline, the hollow shaft is connected to the retarder drive shaft (36) via a second spline, and the retarder output flange (2) is connected to the retarder drive shaft (36) via a third spline.

7. The independently installed series hydraulic retarder according to claim 6, characterized in that: At the connection between the bearing housing (37) and the oil seal seat (38), the oil seal seat (38) has a protruding end that extends into the inner cavity of the bearing housing (37) to form an overlap between the bearing housing (37) and the oil seal seat (38), and a first O-ring seal (32) is provided at the overlap.

8. The independently installed series hydraulic retarder according to claim 7, characterized in that: The bearing housing (37) has a stop that is adapted to the size of the retarder housing. A second O-ring seal (33) is provided on the outer ring of the stop. An oil seal mounting hole and an axial limiting ring (376) are provided on the inner ring of the stop. A second oil seal (34) is provided in the oil seal mounting hole. The second oil seal (34) is axially limited between the bearing housing (37) and the retarder housing by the axial limiting ring (376). The outer ring of the second oil seal (34) is interference-fitted with the oil seal mounting hole. The inner ring of the second oil seal (34) is sleeved on the outer wall of the hollow shaft.

9. The independently installed series hydraulic retarder according to claim 8, characterized in that: The retarder housing has a mounting interface for a mounting bracket, and the retarder assembly (21) is mounted on the vehicle frame via a mounting bracket connected to the mounting interface for the mounting bracket.

Images