A housing assembly for a hydraulic retarder, a hydraulic retarder and a manufacturing process for a housing assembly

Abstract

Provided are a housing assembly of a hydraulic retarder, the hydraulic retarder, and a manufacturing process of the housing assembly, the housing assembly comprising a first housing serving as at least a part of a housing of an oil tank of the hydraulic retarder, the first housing having a bottom shell and a side shell arranged around the bottom shell; and an oil passage assembly for guiding working oil from the oil tank to a power part and / or a bearing part of the hydraulic retarder, the oil passage assembly being arranged in the first housing, characterized in that the oil passage assembly has a second housing formed separately from the first housing. Thus, the machining of the housing assembly is facilitated, the machining difficulty is reduced, the flatness of the machined surface is improved, and the sealing performance of the assembled housing assembly is improved.

Description

Technical Field

[0001] This invention relates to a hydraulic retarder, a hydraulic braking device, specifically to a housing assembly of a hydraulic retarder, the hydraulic retarder itself, and its manufacturing process. Background Technology

[0002] With the continuous improvement of powertrain systems in modern automobiles, especially large trucks, and the increasing load capacity and pursuit of speed, traditional braking methods are no longer sufficient. Hydraulic retarders, as a type of hydraulic machinery, use a rotor-driven working fluid under the reverse torque of the stator to provide auxiliary braking for the vehicle. As an auxiliary braking device, hydraulic retarders are not only used in large trucks, but also increasingly favored in passenger vehicles due to their excellent braking performance.

[0003] The housing assembly of the hydraulic retarder is a crucial component. Because it contains oil channels and an oil-gas separator, both of which are currently integrally formed with the first housing, typically through stamping or casting. However, the structures of the oil channels and oil-gas separator are quite complex. For integral stamping or casting, the mold design is intricate, the machining process is difficult, and the resulting product exhibits certain quality issues regarding flatness. Furthermore, the integrally formed housing assembly suffers from poor sealing performance.

[0004] Based on the above problems, the mold design time for the housing component of the hydraulic retarder is long, the mold processing cycle is high, and the mold cost is also high, and the product yield cannot be effectively guaranteed. Summary of the Invention

[0005] The purpose of this invention is to provide a housing assembly for a hydraulic retarder, which has a simple structure and can reduce the design difficulty of the housing assembly mold, reduce the molding cycle of the mold and reduce production costs. In addition, it can improve the yield rate of the housing assembly, improve the surface flatness of the housing assembly, and thus improve the sealing performance of the housing assembly after assembly.

[0006] The present invention is implemented as follows: In a first aspect, an example of the present invention provides a housing assembly for a hydraulic retarder, including a first housing, an oil passage assembly, and an oil-gas separation assembly. The first housing serves as at least a portion of the housing of the oil tank of the hydraulic retarder. The first housing has a bottom shell and side shells, with the side shells disposed around the bottom shell. The oil passage assembly is used to guide working oil from the oil tank to the power section and / or bearing section of the hydraulic retarder. The oil passage assembly is disposed within the first housing. The invention is characterized in that the oil passage assembly has a second housing, which is separately formed from the first housing.

[0007] Furthermore, the second housing is coupled to the first housing in shape and / or material.

[0008] Furthermore, the oil passage assembly has a main oil passage and a lubricating oil passage. The main oil passage has a main oil passage inlet at its lower part, and the lubricating oil passage has a lubricating oil passage inlet at its lower part. The main oil passage inlet and the lubricating oil passage inlet are in fluid communication.

[0009] Furthermore, the first housing has a first channel and a second channel, the first channel and the second channel being in fluid communication with the first hole and the second hole of the oil passage assembly, respectively.

[0010] Furthermore, the oil passage assembly has a sealing element on the opposite side of the first housing for sealing the first channel and / or the second channel.

[0011] Furthermore, the housing assembly also has a sealing gasket disposed on the end face of the oil passage assembly and the first housing, for sealing the first housing and the oil passage assembly.

[0012] Furthermore, the housing assembly also has a partition, and the sealing gasket is disposed between the oil passage assembly and the partition, the partition serving to form the oil passage.

[0013] Furthermore, the housing assembly also has a one-way valve, the valve seat of which is integrally formed with the second housing of the oil passage assembly.

[0014] Furthermore, the one-way valve includes a bearing, an elastic element, and a valve body. The bearing is sleeved on the valve body, one end of the elastic element abuts against the end face of the valve body, and the other end of the elastic element is sleeved on the valve seat.

[0015] Furthermore, the oil passage assembly is threadedly connected to the first housing.

[0016] Furthermore, the main oil passage and the lubricating oil passage are in fluid communication with the chamber of the first housing. When there is a pressure change in the chamber of the first housing, the fluid in the main oil passage and the lubricating oil passage flows in or out.

[0017] Furthermore, the housing assembly also includes an oil-gas separation assembly, which is integrally formed with or separately formed from the first housing, and is located above the oil passage assembly.

[0018] Furthermore, the oil-gas separation assembly is used to separate oil from the discharged gas, and the oil-gas separation assembly has a labyrinth-type oil-gas separation section.

[0019] The present invention is implemented as follows: In a second aspect, an example of the present invention provides a hydraulic retarder, including a housing assembly, a middle cover, and a front cover, wherein the middle cover and the housing assembly constitute the oil tank of the hydraulic retarder, the front cover has a rotor and a stator, and the hydraulic retarder has the housing assembly.

[0020] The present invention is implemented as follows: In a third aspect, an example of the present invention provides a manufacturing process for a housing assembly of a hydraulic retarder, wherein the first housing and the oil passage assembly are formed by casting, and the specific steps are as follows:

[0021] The first shell is die-cast;

[0022] The oil passage components are die-cast;

[0023] The end faces of the first housing and the oil passage assembly are machined to ensure the flatness of the end faces;

[0024] The oil passage assembly is placed inside the first housing, and the first housing and the oil passage assembly are coupled by shape, and then the first housing and the oil passage assembly are threaded together.

[0025] Furthermore, the first housing and / or the oil passage assembly are made of aluminum alloy.

[0026] Compared with the prior art, the present invention provides a housing assembly for a hydraulic retarder, comprising a first housing and an oil passage assembly. The oil passage assembly is separately formed from the first housing, allowing the oil passage assembly to be manufactured separately from the mold of the first housing during production. This reduces the manufacturing difficulty of the first housing itself and improves the flatness of the end face of the first housing and the end face of the oil passage, thereby improving the sealing performance between the end face of the first housing and the end face of the oil passage. The second housing of the oil passage assembly is coupled to the first housing through shape coupling and / or material coupling, which facilitates the stability of the overall structure and helps to prevent the two housings from interfering with each other during installation. They can move relative to each other; the oil passage assembly and the first housing are sealed to the main oil passage inlet and lubricating oil passage inlet of the first housing on one side, and are sealed by sealing rings or end face seals to prevent the working fluid entering the main oil passage inlet or lubricating oil passage inlet from flowing back, and to prevent the working fluid from flowing back into the oil tank composed of the first housing and the middle cover; the oil-gas separation assembly of the first housing is also separately formed relative to the first housing, further reducing the manufacturing difficulty of the first housing mold; in addition, in order to save assembly time, the valve seat of the one-way valve of the housing assembly is integrally formed with the second housing, thereby saving parts and improving assembly efficiency.

[0027] The present invention provides a manufacturing process for a housing assembly of a hydraulic retarder. Compared with the existing technology of integral molding of housing assemblies, this manufacturing process reduces the difficulty of mold making and improves the surface accuracy of mold forming by manufacturing the first housing and the oil passage assembly separately. Furthermore, the separate manufacturing of the first housing and the oil passage assembly is simple to install and has a certain degree of stability. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 Schematic diagram of the hydraulic retarder housing assembly;

[0030] Figure 2 Schematic diagram of the rear of the hydraulic retarder housing assembly;

[0031] Figure 3 Front view of the first housing of the hydraulic retarder housing assembly;

[0032] Figure 4 Front view of the oil passage assembly of the hydraulic retarder housing assembly;

[0033] Figure 5 Front view of the assembled hydraulic retarder housing assembly;

[0034] Figure 6 Figure 5 AA section view in the middle;

[0035] Figure 7 Schematic diagram of the housing assembly of a hydraulic retarder with sealing device;

[0036] Figure 8 Front view of the assembled housing assembly of the hydraulic retarder with sealing device;

[0037] Figure 9 Figure 8 BB section view;

[0038] Figure 10 Figure 9 A magnified view of A in the middle.

[0039] Icons: 1-First housing; 2-Oil passage assembly; 3-Oil-gas separator; 4-Bottom housing; 5-Side housing; 6-Second housing; 7-First channel; 8-Second channel; 9-Mounting hole; 10-First hole; 11-Second hole; 12-Third hole; 13-First support column; 14-Second support column; 15-Third support column; 16-Main oil passage; 17-Lubricating oil passage; 18-Protrusion; 19-Groove; 20-Mounting groove; 21-Sealing gasket; 22-Baffle; 23-One-way valve; 231-Bearing; 232-Elastic element; 233-Valve body. Detailed Implementation

[0040] This invention proposes a housing configuration based on a hydraulic retarder housing assembly. Specifically, the housing assembly is the rear cover of the hydraulic retarder, with one end connected to the heat exchanger of the hydraulic retarder and the other end connected to the middle cover of the hydraulic retarder.

[0041] Appendix Figure 1-2 This is a schematic diagram of the hydraulic retarder housing assembly from different perspectives. The hydraulic retarder housing assembly includes a first housing 1, an oil passage assembly 2, and an oil-gas separation assembly 3. The first housing 1 and the middle cover (not shown) of the hydraulic retarder constitute the oil tank of the hydraulic retarder. The internal volume of the first housing 1 is used to hold the hydraulic oil of the hydraulic retarder.

[0042] The oil passage assembly 2 is an independent component relative to the first housing 1; that is, the first housing 1 and the oil passage assembly 2 are separately formed. The oil passage assembly 2 is used to guide working oil from the oil tank to the power section and / or bearing section of the hydraulic retarder. Specifically, the oil passage assembly 2 connects the working oil in the oil tank to the rotor and stator of the hydraulic retarder, thereby achieving braking and lubrication of the hydraulic retarder. In the prior art, the first housing and the oil passage assembly are both set as a single unit. Because the oil passage assembly also has many formed surfaces, the processing of the first housing and the oil passage assembly as a single unit is difficult, and the mold structure design is complex and costly. Furthermore, the flatness of the end faces after the first housing and the oil passage assembly are processed together is difficult to guarantee, resulting in certain defects in sealing performance. The first housing 1 and the oil passage assembly 2 used in this invention are formed separately. Molds can be made separately for the first housing 1 and the oil passage assembly 2. The molds are simple and it is easy to ensure the flatness of the end faces of the first housing 1 and the oil passage assembly 2, thereby reducing the molding cycle of the mold, increasing the yield of products produced by the mold, and improving the sealing performance of the assembled housing assembly.

[0043] The oil-gas separator 3 is integrally formed with or separately formed from the first housing 1. The oil-gas separator 3 separates the working oil from the air in the dynamically balanced gas path. The separated working oil then returns to the oil tank formed by the first housing 1 and the middle cover of the hydraulic retarder. The oil-gas separator 3 is located above the first housing 1. (See attached diagram.) Figure 5 A front view of the assembled hydraulic retarder housing assembly, with the oil-gas separation assembly 3 positioned above the oil passage assembly 2.

[0044] The oil-gas separation component 3 has a labyrinth-type oil-gas separation section, which further enhances the oil-gas separation efficiency through multiple curved baffles.

[0045] The first housing 1 has a bottom shell 4 and side shells 5. The side shells 5 are arranged around the periphery of the bottom shell 4 and have a certain thickness to ensure proper filling of the working oil in the oil tank. The bottom shell 4 of the first housing 1 has a first channel 7 and a second channel 8, both of which are connected to the heat exchanger of the hydraulic retarder. One of the channels is connected to the working oil inlet of the heat exchanger, and the other is connected to the working oil outlet. Heat exchange in the heat exchanger reduces the temperature of the working oil after the outlet. To further enhance the sealing between the first housing 1 and the heat exchanger of the hydraulic retarder, ensuring that working oil can effectively enter the heat exchanger without leaking into the oil tank, the oil passage assembly 2 has a sealing end plate on the opposite side of the first housing 1. The oil passage assembly 2 is sealed to the first channel 7 and / or the second channel 8 on one side of the first housing 1. Specifically, sealing elements, which can be optionally set as sealing rings, are provided on the first channel 7 and the second channel 8.

[0046] The oil passage assembly 2 has a second housing 6 and two oil inlet passages. The second housing 6 has a bottom housing (not shown) and a side housing. The side housing of the oil passage assembly is provided with a mounting hole 9 on its end face. The mounting hole 9 is used to install the second housing 6 of the oil passage assembly 2 to the first housing 1, specifically by means of threaded connection, or more specifically by means of screws or bolts, thereby further improving the fastening between the second housing 6 and the first housing 1.

[0047] Appendix Figure 1 Combined with appendix Figure 4 , attached Figure 4 This is a front view of the oil passage assembly of the hydraulic retarder housing. The oil passage assembly 2 has two inlet oil passages: a main oil passage 16 and a lubricating oil passage 17. Both the main oil passage 16 and the lubricating oil passage 17 are fluidly connected to the oil tank. To facilitate pressurization and entry into the main oil passage 16 and / or the lubricating oil passage 17 when the oil level in the tank is low, the connection ports of the main oil passage 16 and the lubricating oil passage 17 to the oil tank are preferably located at the bottom. The main oil passage 16 has a main oil passage inlet at the bottom, and the lubricating oil passage 17 has a lubricating oil passage inlet at the bottom. The main oil passage inlets and the lubricating oil passage inlets are fluidly connected. Of course, the height of the connection ports of the oil passages can be appropriately increased if the minimum oil level is permissible.

[0048] The main oil passage 16 of the oil passage assembly 2 is fluidly connected to the main oil passage inlet of the first housing 1, and the lubricating oil passage 17 of the oil passage assembly 2 is fluidly connected to the lubricating oil passage inlet of the first housing 1.

[0049] The main oil passage 16 and the lubricating oil passage 17 are in fluid communication with the chamber of the first housing 1, which forms part of the oil tank. By pressurizing the space above the first housing 1, there is a pressure change in the chamber of the first housing 1. Under the pressure change, the working oil in the chamber flows in or out through the main oil passage inlet and the lubricating oil passage inlet.

[0050] Appendix Figure 3 This is a front view of the first housing of the hydraulic retarder housing assembly. The bottom shell 4 of the first housing 1 also has a first support column 13, a second support column 14, and a third support column 15. The number of support columns is only illustrative and can be increased or decreased accordingly. The first support column 13, the second support column 14, and the third support column 15 are integrally formed with the first housing 1, and at least one of the three support columns is used to connect to the middle cover of the hydraulic retarder. The support columns can be optionally configured as stepped support columns, which reduces material usage and the overall weight of the hydraulic retarder while ensuring the strength of the support columns.

[0051] Appendix Figure 5 This is a front view of the assembled hydraulic retarder housing assembly, in conjunction with the attached... Figure 2 , 5 To ensure the strength of the oil tank formed by the first housing 1 and the middle cover of the hydraulic retarder, and to facilitate the positioning and support between the first housing 1 and the oil passage assembly 2, the second support column 14 in the first housing 1 passes through the third hole 12 in the oil passage assembly 2 and abuts against the middle cover of the hydraulic retarder. To ensure the communication between the working oil in the oil passage assembly 2 and the working oil in the heat exchanger, the bottom of the second housing 6 in the oil passage assembly 2 has a first hole 10 and a second hole 11, wherein the first hole 10 communicates with the second channel 8 of the first housing 1, and the second hole 11 communicates with the first channel 7 of the first housing 1.

[0052] Appendix Figure 5 Combined with appendix Figure 6 , attached Figure 6 For the appendix Figure 5A sectional view (AA). To facilitate installation between the first housing 1 and the second housing 6, the first housing 1 and the second housing 6 can be coupled by shape and / or material. Under the shape coupling of the first housing 1 and the second housing 6, both the first housing 1 and the second housing 6 are provided with mounting positioning elements. A protrusion 18 is provided on the bottom shell 4 of the first housing 1, and a groove 19 is provided at the corresponding location on the second housing 6. The protrusion 18 on the first housing 1 and the groove 19 on the second housing 6 limit the positioning, which facilitates the installation of the first housing 1 and the second housing 6.

[0053] In other possible embodiments, the first housing 1 and the second housing 6 are connected by material coupling, such as thermofusion welding, friction welding or bonding.

[0054] To facilitate the connection between the first housing 1 in the rear cover of the hydraulic retarder and the middle cover of the hydraulic retarder, a mounting groove 20 is provided on the bottom shell of the first housing 1 in the rear cover of the hydraulic retarder, opposite to the back of the middle cover. The first housing 1 is connected to the middle cover by bolts through the mounting groove 20. To prevent interference, the mounting surface is set on the bottom surface inside the mounting groove 20, so that after the bolt is installed, the bolt head is located inside the mounting groove 20, thereby preventing the bolt head from protruding from the first housing 1 and causing interference with other components.

[0055] To improve the sealing performance of the connection between the hydraulic retarder rear cover and the hydraulic retarder middle cover, the first housing 1 of the hydraulic retarder rear cover housing assembly and the oil passage assembly 2 are sealed to the end face of the middle cover. After the first housing 1 and the oil passage assembly 2 are assembled, a sealing gasket 21 is provided on their free end face to seal the first housing 1 and the oil passage assembly 2.

[0056] Furthermore, the present invention also relates to a hydraulic retarder, comprising a housing assembly, a middle cover, and a front cover. The middle cover and the housing assembly constitute the oil tank of the hydraulic retarder. The front cover has a rotor and a stator. When the hydraulic retarder is working, the hydraulic retarder pressurizes the cavity above the oil tank, thereby causing the working oil in the oil tank to enter the main oil passage 16 and the lubrication oil passage 17 of the oil passage assembly 2. The main oil passage 16 transmits the working oil through the middle cover to the working chamber formed by the rotor and stator of the front cover. The lubrication oil passage 17 provides working oil to the lubrication oil pump in the hydraulic retarder. When the rotor and stator of the hydraulic retarder are not working, the lubrication oil pump lubricates and cools other components in the front cover that require lubrication.

[0057] See Figure 7-10 , Figure 7 This is a schematic diagram of the housing assembly with sealing device of the hydraulic retarder of the present invention. Figure 8 A front view of the assembled housing assembly of the hydraulic retarder with sealing devices; Figure 9 for Figure 8 BB section view, Figure 10 for Figure 9Enlarged view of A. The hydraulic retarder housing assembly also has a sealing gasket 21 and a partition 22 on the side facing away from the rear cover. By setting the sealing gasket 21 and partition 22, the oil tank and air passage of the hydraulic retarder housing assembly are sealed to a certain extent, and they are used to form oil passages. Specifically, together with the main oil passage and lubrication oil passage on the oil passage assembly 2, they form the main oil passage 16 and lubrication oil passage 17. After the partition 22 and sealing gasket 21 are assembled with the housing assembly, the main oil passage 16 and lubrication oil passage 17 of the oil passage assembly 2 are sealed. Thus, when the oil tank has a certain air pressure, the working oil is forced from the oil tank into the main oil passage 16 and lubrication oil passage 17 under the pressure of the air pressure, and flows out from the corresponding outlet of the partition 22 with the help of the sealing gasket 21 and partition 22. In addition, a one-way valve 23 is provided between the oil passage assembly 2 and the partition 22 of the housing assembly. The one-way valve 23 ensures that the working oil does not enter the working chamber when the hydraulic retarder is not in operation. The valve seat of the one-way valve 23 is integrally formed with the second housing 6 of the oil passage assembly 2, thereby further reducing the number of parts and improving assembly efficiency.

[0058] See appendix Figure 10 The one-way valve 23 of the present invention specifically includes a bearing 231, an elastic element 232, and a valve body 233. The valve body 233 has a valve stem at the left end and a valve plate at the right end, as shown in the figure. The valve stem and valve plate are integrally formed, and a stepped portion exists between them. The bearing 231 is fitted onto the valve stem of the valve body 233 in the form of a guide sleeve, so that the inner surface of the bearing 231 contacts the valve stem, and the outer surface of the bearing 231 contacts the valve seat. The valve seat and the second housing 6 are integrally formed. The bearing 231 is used to increase the guiding properties and provide a certain degree of support in the direction of movement of the valve body 233. To further ensure smooth movement, the bearing 231 is configured as a sliding bearing. One end of the elastic element 232 abuts against the end face of the valve plate near the sealing gasket 21 of the bearing 231, and the other end of the elastic element 232 is sleeved on the valve seat and abuts against the bottom surface of the second housing 6 of the oil passage assembly 2. Through the elastic force of the elastic element 232, it can be ensured that when the hydraulic retarder is not working, the valve body 233 automatically resets and abuts against the partition plate 22 under the action of the elastic force, thereby ensuring that working oil does not enter the working chamber when the hydraulic retarder is not working. Furthermore, the elastic element 232 is configured as a spring.

[0059] To ensure the sealing performance of the one-way valve 23, a layer of elastic material is wrapped around the end face of the valve plate near the partition 22. This elastic material provides a certain sealing performance when the valve plate abuts against the partition 22. Specifically, this elastic material is rubber.

[0060] This invention also relates to a manufacturing process for a housing assembly of a hydraulic retarder, wherein the first housing and the oil passage assembly are formed by casting, and the specific steps are as follows:

[0061] The first housing is die-cast from aluminum alloy.

[0062] The oil passage components are die-cast from aluminum alloy.

[0063] The end faces of the first housing and the oil passage assembly are machined to ensure the flatness of the end faces;

[0064] The oil passage assembly is placed inside the first housing, and the first housing and the oil passage assembly are coupled by shape, and then the first housing and the oil passage assembly are threaded together.

[0065] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the above description, in conjunction with the accompanying drawings, provides a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0066] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0067] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0068] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0069] In this invention, all embodiments, implementation methods, and features can be combined with each other without contradiction or conflict. In this invention, conventional equipment, devices, and components can be commercially available or self-made according to the disclosure of this invention. In this invention, to highlight the key points, some conventional operations and equipment, devices, and components are omitted or only briefly described.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A housing assembly for a hydraulic retarder, comprising a first housing and an oil passage assembly, wherein the first housing serves as at least a portion of the housing of the oil tank of the hydraulic retarder, the first housing having a bottom shell and side shells, the side shells being disposed around the bottom shell; the oil passage assembly is used to guide working oil from the oil tank to the power section and / or bearing section of the hydraulic retarder; the oil passage assembly is disposed within the first housing, characterized in that: The oil passage assembly has a second housing, which is separately formed from the first housing.

2. The housing assembly according to claim 1, characterized in that: The second housing is coupled to the first housing in shape and / or material.

3. The housing assembly according to claim 1, characterized in that: The oil passage assembly has a main oil passage and a lubricating oil passage. The main oil passage has a main oil passage inlet at the bottom, and the lubricating oil passage has a lubricating oil passage inlet at the bottom. The main oil passage inlet and the lubricating oil passage inlet are in fluid communication.

4. The housing assembly according to claim 1, characterized in that: The first housing has a first channel and a second channel, which are in fluid communication with the first hole and the second hole of the oil passage assembly, respectively.

5. The housing assembly according to claim 4, characterized in that: The oil passage assembly is sealed to the end face of the first housing.

6. The housing assembly according to claim 5, characterized in that: The oil passage assembly has a sealing element on the opposite side of the first housing for sealing the first passage and / or the second passage.

7. The housing assembly according to claim 1, characterized in that: The housing assembly also has a sealing gasket disposed on the end face of the oil passage assembly and the first housing, for sealing the first housing and the oil passage assembly.

8. The housing assembly according to claim 7, characterized in that: The housing assembly also has a partition, and the sealing gasket is disposed between the oil passage assembly and the partition, the partition serving to form the oil passage.

9. The housing assembly according to claim 1, characterized in that: The housing assembly also has a one-way valve, the valve seat of which is integrally formed with the second housing of the oil passage assembly.

10. The housing assembly according to claim 9, characterized in that: The one-way valve includes a bearing, an elastic element, and a valve body. The bearing is sleeved on the valve body, one end of the elastic element abuts against the end face of the valve body, and the other end of the elastic element is sleeved on the valve seat.

11. The housing assembly according to claim 1, characterized in that: The oil passage assembly is threadedly connected to the first housing.

12. The housing assembly according to claim 3, characterized in that: The main oil passage and the lubricating oil passage are in fluid communication with the chamber of the first housing. When there is a pressure change in the chamber of the first housing, the fluid in the main oil passage and the lubricating oil passage flows in or out.

13. The housing assembly according to any one of claims 1-12, characterized in that: The housing assembly further includes an oil-gas separation assembly, which is integrally formed with or separately formed from the first housing, and is located above the oil passage assembly.

14. The housing assembly according to claim 13, characterized in that: The oil-gas separation assembly is used to separate oil from the discharged gas, and the oil-gas separation assembly has a labyrinth-type oil-gas separation section.

15. A hydraulic retarder, comprising a housing assembly, a middle cover, and a front cover, wherein the middle cover and the housing assembly constitute the oil tank of the hydraulic retarder, and the front cover has a rotor and a stator, characterized in that: The housing assembly of the hydraulic retarder is the housing assembly as described in any one of claims 1-14.

16. A manufacturing process for a housing assembly of a hydraulic retarder, characterized in that, The first housing and oil passage assembly are formed by casting, and the specific steps are as follows: The first shell is die-cast; The oil passage components are die-cast; The end faces of the first housing and the oil passage assembly are machined to ensure the flatness of the end faces; The oil passage assembly is placed inside the first housing, and the first housing and the oil passage assembly are coupled by shape, and then the first housing and the oil passage assembly are threaded together.

17. The manufacturing process of the housing assembly according to claim 16, characterized in that: The first housing and / or the oil passage assembly are made of aluminum alloy.

18. The manufacturing process of the housing assembly according to claim 16, characterized in that: It also has a one-way valve and a partition. The one-way valve is located between the oil passage assembly and the partition. The oil passage assembly is die-cast, and the second housing of the oil passage assembly is integrally formed with the valve seat of the one-way valve.

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