A lubrication and heat dissipation structure for a hydrodynamic retarder independent mounting bearing

Abstract

The utility model discloses a kind of lubrication heat dissipation structures for hydraulic retarder independent installation bearing, to solve two problems of prior art: one is that part lubrication structure design is complex, assembly and maintenance are inconvenient, reliability and practicality are difficult to take into account;Two is that independent installation bearing of independent installation hydraulic retarder lacks effective lubrication heat dissipation scheme, is easily damaged due to high temperature ablation, wear aggravation, affect the overall performance of hydraulic retarder.The structure includes ring-shaped bearing cover, sealing ring and other components that are sleeved on the outer of the independent installation bearing of hydraulic retarder, the bearing cover is provided with air hole, oil hole and first blind groove, second blind groove respectively communicated therewith, the above-mentioned hole and blind groove are all communicated with the inner and outer ring gap of independent installation bearing, form closed loop lubricating oil circuit, so that lubricating oil circulation can realize the continuous lubrication of independent installation bearing of hydraulic retarder, and can quickly take away the heat generated by high-speed operation of independent installation bearing of hydraulic retarder, and structure is simple, assembly and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to a lubrication and heat dissipation structure, specifically a lubrication and heat dissipation structure for an independently mounted bearing in a hydraulic retarder. Background Technology

[0002] As a core auxiliary braking device for commercial vehicles, hydraulic retarders are widely used in various commercial vehicle fields such as tractors, trucks, buses, and construction machinery. Their core function is to provide stable braking force for vehicles. Especially under heavy load and long downhill conditions, they can continuously output large braking force without attenuation, effectively avoiding the risk of brake failure caused by heat fade in traditional braking systems. They are a key component to ensure the driving safety of commercial vehicles. When a hydraulic retarder is working, the high-speed rotation of its internal transmission components generates a large amount of heat, and the relative friction between the components requires reliable lubrication to maintain operational stability. Therefore, lubrication and heat dissipation performance are the core guarantee conditions for ensuring the normal operation of a hydraulic retarder.

[0003] In the prior art, Chinese patent CN115163699A discloses a lubrication structure for a hydraulic retarder. This structure includes components such as a drive gear, a transmission shaft, and a bearing assembly. By setting a first fixed-point oil injection mechanism and a second fixed-point oil injection mechanism, lubricating oil from the transmission is delivered into the lubrication chamber through a first lubrication oil passage, a second lubrication oil passage, and a third lubrication oil passage, respectively, to lubricate the bearing assembly and the skeleton oil seal. The lubricated oil can flow back to the transmission through the roller gaps of the bearing assembly. This technical solution can achieve continuous and stable lubrication of the bearings and oil seals, and operates independently of the retarder working oil chamber, without consuming the retarder working oil, thus alleviating the lubrication and heat dissipation problem of the bearings to a certain extent. However, it still has significant technical defects: its lubrication structure adopts a nested layout design of multiple lubrication oil passages and multiple oil injection mechanisms, resulting in high structural complexity. This not only places extremely high demands on assembly precision, leading to a significant increase in manufacturing costs, but also significantly increases the difficulty of subsequent maintenance and upkeep, which is not conducive to the large-scale application and promotion of this technology. To simplify installation and disassembly processes and reduce maintenance difficulty, the industry commonly adopts independently mounted hydraulic retarders, where the retarder is independently assembled on the retarder shaft and transmits power directly through a flange. In this independently mounted structure, there are two types of complementary key bearing components: the bearings in the retarder's working chamber and the independently mounted bearings. These two components form a "cooperative support and division of labor" relationship, jointly ensuring the stable operation of the retarder. The bearings in the retarder's working chamber are equipped with dedicated circulating oil circuits, achieving coordinated lubrication and heat dissipation. However, the independently mounted bearings, limited by their structural layout design, lack a corresponding oil lubrication system and can only rely on natural heat dissipation to dissipate the heat generated during operation. In high-intensity working scenarios such as heavy-load long downhill slopes, the independently mounted bearings operate at high speeds for extended periods, and the large amount of heat generated cannot be dissipated in time. Simultaneously, the lack of continuous and effective lubrication makes this component highly susceptible to high-temperature erosion, accelerated wear, and other failures, severely affecting the reliability and service life of the hydraulic retarder. This has become a key technical bottleneck restricting the application effectiveness of independently mounted hydraulic retarders. Utility Model Content

[0004] The purpose of this invention is to address two prominent problems in the existing technology: First, some existing lubrication structures are complex in design, inconvenient to assemble and maintain, and difficult to balance reliability and practicality; second, for independently mounted hydraulic retarders, the critical independently mounted bearings are limited by the structural layout and lack an effective lubrication and heat dissipation solution, resulting in insufficient lubrication and heat dissipation, easy damage, and consequently affecting the overall performance of the hydraulic retarder. Therefore, this invention provides a lubrication and heat dissipation structure for independently mounted bearings in hydraulic retarders.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A lubrication and heat dissipation structure for an independently mounted bearing in a hydraulic retarder, wherein the independently mounted bearing is fitted with an annular bearing cap; its special feature is that: The bearing cap is provided with a vent hole and a lubrication hole along its radial direction; The inner wall of the bearing cover is provided with a first blind groove and a second blind groove that are closed at one end along its axial direction. The first blind groove and the second blind groove are respectively connected to the vent hole and the oil filling hole; A gap is provided between the closed end face of the first blind groove and the second blind groove and the first end face of the hydraulic retarder independently mounted bearing to be lubricated and cooled, so that the first blind groove and the second blind groove are connected to the gap between the inner and outer rings of the hydraulic retarder independently mounted bearing to be lubricated and cooled; the first end is the end of the hydraulic retarder independently mounted bearing to be lubricated and cooled that is close to the closed end of the first blind groove and the second blind groove.

[0006] Furthermore, the vent hole and the oil filling hole are coaxial, and this axis intersects and is perpendicular to the axis of the bearing cover.

[0007] Furthermore, the openings of the vent and the filler hole are respectively threaded with plugs; A sealing ring is provided between the outer wall of the screw of the plug and the inner wall of the vent or oil filling hole.

[0008] Furthermore, it also includes a sealing ring; The sealing ring is located at the second end of the independently mounted bearing of the hydraulic retarder to be lubricated and cooled, and is fixedly connected to the bearing cover; the second end is the end of the independently mounted bearing of the hydraulic retarder to be cooled that is close to the open end of the first blind groove and the second blind groove. The sealing ring has a first notch and a second notch on the inner wall of the end near the first blind groove and the second blind groove; The first notch and the second notch are respectively connected to the open ends of the first blind groove and the second blind groove, and are respectively connected to the gap between the inner and outer rings of the hydraulic retarder independently installed bearing to be lubricated and cooled.

[0009] Furthermore, it also includes the first oil seal; The first oil seal is nested on the inner wall of the sealing ring, and the cutting edge of the first oil seal faces the hydraulic retarder bearing to be lubricated and cooled.

[0010] Furthermore, it also includes a second oil seal; The second oil seal is nested on the inner wall of the bearing cap on the axial side away from the sealing ring.

[0011] Furthermore, it also includes dust covers; The dust cover is nested on the inner wall of the sealing ring and located outside the first oil seal, with the cutting edge of the dust cover facing away from the first oil seal.

[0012] The beneficial effects of this utility model are: 1. The lubrication and heat dissipation structure for the independently mounted bearing of the hydraulic retarder proposed in this utility model, by opening a vent hole and a lubrication hole on the bearing cover, as well as a first blind groove and a second blind groove that are respectively connected to the vent hole and the lubrication hole, and the vent hole, the lubrication hole, the first blind groove and the second blind groove are all connected to the gap between the inner and outer rings of the independently mounted bearing of the hydraulic retarder to be lubricated and cooled, so that a lubricating oil passage is formed inside the bearing cover, and the lubricating oil can flow freely in the lubricating oil passage, thereby allowing the lubricating oil to lubricate the independently mounted bearing of the hydraulic retarder and more quickly remove the heat generated by the high-speed rotation of the independently mounted bearing of the hydraulic retarder.

[0013] 2. The lubrication and heat dissipation structure for independently mounted bearings of hydraulic retarders proposed in this utility model expands the lubrication oil passage by opening a first notch and a second notch on the sealing ring, which are respectively connected to the open ends of the first blind groove and the second blind groove, and increases the oil storage capacity to a certain extent, thus avoiding excessively high temperature rise rate of the lubricating oil due to insufficient lubricating oil.

[0014] 3. The lubrication and heat dissipation structure for the independently mounted bearing of the hydraulic retarder proposed in this utility model adopts a splash lubrication method similar to that of a gearbox to lubricate the independently mounted bearing of the hydraulic retarder. The lubricating oil only needs to cover the end of the inner ring of the independently mounted bearing near the oil filling hole. When the independently mounted bearing of the hydraulic retarder rotates, the lubricating oil at the bottom of the bearing can be carried to the entire independently mounted bearing of the hydraulic retarder, thereby reducing oil resistance and improving heat dissipation.

[0015] 4. The lubrication and heat dissipation structure for the independently mounted bearing of the hydraulic retarder proposed in this utility model achieves lubrication and heat dissipation for the independently mounted bearing by opening vent holes, oil filling holes, and corresponding blind grooves on the bearing cover, together with two notches on the sealing ring, to form a complete lubrication oil circuit. It adopts a method similar to gearbox splash lubrication. This structure is simple and compact, requiring no additional complex oil circuits or oil injection mechanisms. It not only simplifies the assembly process and reduces installation accuracy requirements, but also significantly reduces manufacturing costs and subsequent maintenance difficulties, while simultaneously ensuring reliability and practicality. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of a lubrication and heat dissipation structure for an independently mounted bearing in a hydraulic retarder according to the present invention; Figure 2 This is a cross-sectional view of an embodiment of the present utility model; Figure 3 This is a three-dimensional structural diagram of the bearing cover in an embodiment of this utility model; Figure 4 This is a three-dimensional structural diagram of the sealing ring in an embodiment of this utility model.

[0017] The attached figures are labeled as follows: 1-Ventilation hole, 2-Bearing cover, 21-First blind groove, 22-Second blind groove, 3-Independent bearing for hydraulic retarder, 4-Sealing ring, 41-First notch, 42-Second notch, 5-Dust cover, 6-First oil seal, 7-Screw plug, 8-Second oil seal, 9-Oil filling hole. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] This utility model provides a lubrication and heat dissipation structure for an independently mounted bearing in a hydraulic retarder, combined with... Figure 1 and Figure 2 As shown, the lubrication and heat dissipation structure includes an annular bearing cover 2, a sealing ring 4, a first oil seal 6, a second oil seal 8, and a dust cover 5, all mounted on the hydraulic retarder independently mounted bearing 3.

[0020] The bearing cap 2 has a vent hole 1 and a lubrication hole 9 coaxially arranged along its radial direction, and the axis of the vent hole 1 intersects and is perpendicular to the axis of the bearing cap 2. The openings of the vent hole 1 and the lubrication hole 9 are respectively threaded with plugs 7, and a sealing ring is provided between the outer wall of the screw of the plug 7 and the inner wall of the vent hole 1 or the lubrication hole 9 to enhance the sealing performance.

[0021] Combination Figure 2 and Figure 3 As shown, the inner wall of the bearing cover 2 is provided with a first blind groove 21 and a second blind groove 22 along its axial direction, which are respectively connected to the vent hole 1 and the oil filling hole 9 and are closed at one end. There is a gap between the closed end face of the first blind groove 21 and the second blind groove 22 and the end face of the hydraulic retarder independently mounted bearing 3 to be lubricated and cooled near the closed end of the first blind groove 21 and the second blind groove 22, so that the first blind groove 21 and the second blind groove 22 are connected to the gap between the inner and outer rings of the hydraulic retarder independently mounted bearing 3 to be lubricated and cooled, so that a lubricating oil passage is formed inside the bearing cover.

[0022] Combination Figure 2 and Figure 4 As shown, the sealing ring 4 is located at one end of the hydraulic retarder independently mounted bearing 3, which is to be lubricated and cooled, near the open ends of the first blind groove 21 and the second blind groove 22, and is fixedly connected to the bearing cover 2; the inner wall of the sealing ring 4 near the first blind groove 21 and the second blind groove 22 is provided with a first notch 41 and a second notch 42; in this embodiment, the sealing ring 4 is a labyrinth sealing ring, and its first notch 41 and the second notch 42 are respectively connected to the open ends of the first blind groove 21 and the second blind groove 22, and are respectively connected to the gap between the inner and outer rings of the hydraulic retarder independently mounted bearing 3, which allows lubricating oil to flow into the labyrinth sealing ring cavity through the first notch 41 and the second notch 42, thereby expanding the lubricating oil path and increasing the oil storage capacity to a certain extent.

[0023] Combination Figures 1-4As shown, the first oil seal 6 is nested on the inner wall of the sealing ring 4, and the cutting edge of the first oil seal 6 faces the hydraulic retarder bearing 3 which is independently installed to be lubricated and cooled, so as to prevent lubricating oil from leaking from the side of the sealing ring 4 away from the bearing cover 2.

[0024] The second oil seal 8 is nested on the inner wall of the bearing cover 2 on the axial side away from the sealing ring 4 to prevent lubricating oil from leaking from the axial side of the bearing cover 2 away from the sealing ring 4.

[0025] The dust cover 5 is nested on the inner wall of the sealing ring 4 and located outside the first oil seal 6. The cutting edge of the dust cover 5 faces away from the first oil seal 6 to prevent external dust from entering the lubrication oil passage.

[0026] The specific working principle and usage method of this utility model are as follows: Open the screw plugs 7 connected to the vent 1 and the oil filling hole 9 respectively, allowing the vent 1 to be open to the atmosphere. Use a U-shaped tube to add lubricating oil through the oil filling hole 9. Observe the oil level in the U-shaped tube. When the oil level is approximately level with 1 / 3 of the radial height of the bearing cap 2, the lubricating oil should cover the end of the inner ring of the hydraulic retarder independently mounted bearing 3 near the oil filling hole 9. Stop adding oil. No grease is added inside the hydraulic retarder independently mounted bearing 3 to prevent grease from clogging the lubrication passages and hindering the circulation of lubricating oil. The lubricating oil forms a low-resistance oil film on the surface of the hydraulic retarder independently mounted bearing 3, thereby reducing wear on the hydraulic retarder independently mounted bearing 3 and reducing the heat generated by friction between the hydraulic retarder independently mounted bearing 3 and other components.

[0027] During operation, a splash lubrication method similar to that used in gearboxes is employed. The high-speed rotation of the hydraulic retarder's independently mounted bearing 3 allows the lubricating oil near the oil filling hole 9 on the inner ring of the bearing to be carried across the entire bearing. This enables the lubricating oil to not only lubricate the bearing but also quickly dissipate the heat generated by its high-speed rotation, thereby increasing the bearing's maximum rotational speed and extending its service life.

[0028] Meanwhile, the first notch 41 and the second notch 42 on the sealing ring 4, which are respectively connected to the open ends of the first blind groove 21 and the second blind groove 22, expand the lubrication oil passage and increase the oil storage capacity to a certain extent, so as to avoid the lubrication oil temperature rise rate being too high due to insufficient lubrication oil.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical solutions disclosed in this utility model should be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A lubrication and heat dissipation structure for an independently mounted bearing of a hydraulic retarder, wherein the independently mounted bearing (3) of the hydraulic retarder is fitted with an annular bearing cap (2); characterized in that: The bearing cap (2) is provided with a vent hole (1) and a lubrication hole (9) along its radial direction; The inner wall of the bearing cover (2) is provided with a first blind groove (21) and a second blind groove (22) with one end closed along its axial direction. The first blind groove (21) and the second blind groove (22) are respectively connected to the vent (1) and the oil filling hole (9); A gap is provided between the closed end face of the first blind groove (21) and the second blind groove (22) and the first end face of the hydraulic retarder independent mounting bearing (3) to be lubricated and cooled, so that the first blind groove (21) and the second blind groove (22) are connected to the gap between the inner and outer rings of the hydraulic retarder independent mounting bearing (3) to be lubricated and cooled; the first end is the end of the hydraulic retarder independent mounting bearing (3) to be lubricated and cooled near the closed end of the first blind groove (21) and the second blind groove (22).

2. The lubrication and heat dissipation structure for independently mounted bearings in a hydraulic retarder according to claim 1, characterized in that: The vent (1) and the oil filling hole (9) are coaxial, and the axis intersects and is perpendicular to the axis of the bearing cover (2).

3. The lubrication and heat dissipation structure for independently mounted bearings in a hydraulic retarder according to claim 1 or 2, characterized in that: The openings of the vent (1) and the oil filling hole (9) are respectively threaded with plugs (7); A sealing ring is provided between the outer wall of the screw of the plug (7) and the inner wall of the vent (1) or the oil filling hole (9).

4. The lubrication and heat dissipation structure for independently mounted bearings in a hydraulic retarder according to claim 1, characterized in that: It also includes a sealing ring (4); The sealing ring (4) is located at the second end of the hydraulic retarder independently mounted bearing (3) to be lubricated and cooled, and is fixedly connected to the bearing cover (2); the second end is the end of the hydraulic retarder independently mounted bearing (3) to be lubricated and cooled near the open end of the first blind groove (21) and the second blind groove (22); The sealing ring (4) has a first notch (41) and a second notch (42) on the inner wall of one end near the first blind groove (21) and the second blind groove (22); The first notch (41) and the second notch (42) are connected to the open ends of the first blind groove (21) and the second blind groove (22), respectively, and are connected to the gap between the inner and outer rings of the hydraulic retarder independently mounted bearing (3) to be lubricated and cooled.

5. The lubrication and heat dissipation structure for independently mounted bearings in a hydraulic retarder according to claim 4, characterized in that: It also includes the first oil seal (6); The first oil seal (6) is nested on the inner wall of the sealing ring (4), and the cutting edge of the first oil seal (6) faces the hydraulic retarder bearing (3) to be lubricated and cooled.

6. The lubrication and heat dissipation structure for independently mounted bearings in a hydraulic retarder according to claim 5, characterized in that: It also includes the second oil seal (8); The second oil seal (8) is nested on the inner wall of the bearing cover (2) on the axial side away from the sealing ring (4).

7. The lubrication and heat dissipation structure for independently mounted bearings in a hydraulic retarder according to claim 6, characterized in that: It also includes a dust cover (5); The dust cover (5) is nested on the inner wall of the sealing ring (4) and located on the outside of the first oil seal (6), with the cutting edge of the dust cover (5) facing away from the first oil seal (6).

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