Zero leakage floating oil seal assembly for concrete mixer truck

Abstract

The utility model discloses a zero leakage floating oil seal assembly for concrete mixing transport vehicle, including walking motor main body that is composed of speed reducer assembly and drive assembly, the opposite side of speed reducer assembly and drive assembly all is equipped with sealed clamping seat, the inside of two sealed clamping seat all is equipped with floating oil seal, the cross section of two floating oil seals all is L shape setting, the opposite side surface of floating oil seal all forms the sealing surface, the utility model discloses the inside of the sealing surface of two L shape floating oil seal opposite side, radially extends out trapezoidal boss, and the two end bevel and the middle V bevel jointly constitute the unique lubricating oil flow channel, and this structure can guide the lubricating oil in the cavity and actively overflow between two sealing surfaces, forms and maintains a layer stable sealing oil film, this layer oil film not only greatly reduces the dry friction and wear between sealing surface, improves the service life of sealing pair, and still can rely on fluid power sealing effect and realize zero leakage.

Description

Technical Field

[0001] This utility model relates to the field of floating oil seal technology, specifically to a zero-leakage floating oil seal assembly for concrete mixer trucks. Background Technology

[0002] Zero-leakage floating oil seal assemblies for concrete mixer trucks are mainly used in the rotary sealing parts of the travel motor and mixing drum drive end of heavy engineering vehicles. Their function is to completely seal the lubricating oil or gear oil inside the transmission cavity in construction environments with high dust, high impact, and continuous vibration. At the same time, they provide long-lasting lubrication for the support rollers, guide rollers, sprockets, and mixing drum reducers. Due to the long operation cycle, complex transportation routes, and frequent entry and exit from muddy construction sites, if traditional seals fail, not only will grease leak out, polluting the environment and concrete quality, but insufficient lubrication will also lead to premature wear of bearings and gears, increasing the frequency of downtime for maintenance.

[0003] In existing technologies, floating oil seals are typically installed in pairs inside the travel motor. The axial elasticity provided by the O-rings keeps the two metal ring end faces tightly fitted, forming an end face sealing cavity to store lubricating oil. However, after long-term operation, the rubber rings age at high temperatures and their elasticity decreases. Grooves appear on the metal ring contact surfaces due to micro-vibration wear, resulting in a decrease in sealing pressure and an exponential increase in the probability of leakage. Once the grease is lost, the transmission pair is instantly in a state of dry friction, significantly shortening its service life. In addition, the traditional structure is arranged "back to back," with a very small gap between the two oil seals. Disassembly and assembly require special pullers and are prone to damage to the sealing end faces. On-site maintenance takes more than 2 hours, seriously affecting the construction progress.

[0004] Therefore, a zero-leakage floating oil seal assembly for concrete mixer trucks is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a zero-leakage floating oil seal assembly for concrete mixer trucks to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a zero-leakage floating oil seal assembly for concrete mixer trucks, comprising a travel motor body composed of a reducer assembly and a drive assembly. Each reducer assembly and drive assembly has a sealing seat on its opposite side. A floating oil seal is provided inside each of the two sealing seats. The cross-section of each floating oil seal is L-shaped. A sealing surface is formed on the opposite side surface of each floating oil seal. A trapezoidal boss extends radially inward from the side of the inner wall of each floating oil seal near the sealing surface. Inclined surfaces are formed at both radial ends of each boss. The opposite side of the middle inclined surface is V-shaped, facilitating the overflow of lubricating oil between the two sealing surfaces to form a sealing oil film. A sealing ring is fitted inside each of the two floating oil seals.

[0007] Preferably, side guard rings extend radially in opposite directions from the outer wall edges of both floating oil seals, and the thickness of the extended side guard rings is lower than the specified height of the sealing ring, thereby reducing the wear on the side wall of the sealing ring during operation.

[0008] Preferably, the outer sidewalls of the two side guard rings are respectively matched in size with the inner sidewalls of the corresponding sealing brackets.

[0009] Preferably, the reducer assembly includes a sealing seat, a bearing, a limiting ring, and a retaining ring arranged sequentially from the outside to the inside. The bearing is disposed inside the limiting ring, and the outer side wall of the bearing abuts against the inner side wall of the reducer assembly. The retaining ring is engaged on the side of the drive assembly near its output end, limiting the bearing and the limiting ring to the inside.

[0010] The zero-leakage floating oil seal assembly for concrete mixer trucks according to the claim is characterized in that: a fixed flange is installed on the side of the outer wall of the reducer assembly and the drive assembly near the middle, and mounting holes are provided on both fixed flanges.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention, through an innovative design of a floating oil seal structure with trapezoidal bosses and V-shaped bevels, effectively solves the problems of easy wear of the sealing surface and leakage caused by lubrication failure in traditional oil seals under harsh working conditions. Specifically, trapezoidal bosses extend radially inward from the inner side of the sealing surface on one side of the two L-shaped floating oil seals. The bevels at both ends and the V-shaped bevel in the middle together form a unique lubricating oil guiding channel. This structure can guide the lubricating oil in the cavity to actively overflow between the two sealing surfaces, forming and maintaining a stable sealing oil film. This oil film not only greatly reduces dry friction and wear between the sealing surfaces and improves the service life of the sealing pair, but also ensures that even when the sealing pressure decreases under high temperature and vibration conditions, zero leakage can still be achieved by relying on the hydrodynamic sealing effect, fundamentally overcoming the defects of easy leakage in traditional structures.

[0012] This invention significantly improves the wear resistance of the sealing ring and the maintainability of the whole machine by integrating a side guard ring protection mechanism and optimizing the assembly structure. The side guard ring extending radially from the outer edge of the floating oil seal has a thickness lower than the height of the sealing ring, which can effectively isolate external impurities during operation and prevent the floating oil seal from directly scraping the side wall of the sealing ring, thus greatly reducing the wear rate of the sealing ring. Meanwhile, the sloping design on the other side of the boss facilitates maintenance. The oil seal can be safely pushed out for replacement simply by using a simple tool to hold the sloping surface, which greatly reduces the on-site maintenance time from the traditional time consumption and greatly improves equipment uptime and construction efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the floating oil seal structure of this utility model; Figure 2 This is a schematic diagram of the main cross-sectional structure of the present utility model; Figure 3 for Figure 2 A partially enlarged structural diagram; Figure 4 This is a schematic diagram of the overall structure of this utility model.

[0014] The following are the reference numerals: 1. Walking motor body; 11. Reducer assembly; 12. Drive assembly; 13. Sealing bracket; 14. Bearing; 15. Limit ring; 16. Snap ring; 17. Fixed flange; 2. Floating oil seal; 3. Sealing surface; 4. Boss; 5. Bevel; 6. Sealing ring; 7. Side guard ring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1: Please refer to Figures 1-4This utility model provides a technical solution: a zero-leakage floating oil seal assembly for concrete mixer trucks, including a travel motor body 1 composed of a reducer assembly 11 and a drive assembly 12. Each reducer assembly 11 and drive assembly 12 has a sealing seat 13 on its opposite side. Each of the two sealing seats 13 contains a floating oil seal 2. The cross-section of each floating oil seal 2 is L-shaped, and a sealing surface 3 is formed on the opposite side surface of each floating oil seal 2. Under normal operation, the sealing surfaces 3 on both sides form elastic contact. Under conditions of significant vibration, the sealing surfaces 3 on both sides may come into contact, causing wear. To reduce wear, a trapezoidal boss 4 is provided on the inner wall of each floating oil seal 2, extending radially inward from the side near the sealing surface 3. Both ends of the two bosses 4 have inclined surfaces 5, and the opposite side of the middle inclined surface 5 is V-shaped. This allows the internal lubricating oil to flow towards the radially extending trapezoidal boss 4 on the inner wall of the floating oil seal 2 under pressure and centrifugal force. The inclined surfaces 5 at both ends of the boss 4 and the V-shaped inclined surface in the middle together form a guide channel, guiding the lubricating oil into the tiny gap between the two sealing surfaces 3, thereby forming a stable sealing oil film. This oil film lubricates the sealing surfaces 3, reduces wear, and improves service life. Secondly, sealing rings 6 are fitted inside the two floating oil seals 2. The sealing rings 6 contact the reducer assembly 11 and the drive assembly 12 respectively, forming an elastic seal. At the same time, the other inclined surface 5 of the boss plays a key role when the floating oil seal 2 needs to be replaced or maintained. By using external tools, such as a flathead screwdriver, to press against the other inclined surface 5, the floating oil seal 2 can be easily disassembled. Compared with the existing technology, this will not damage the connection of the floating oil seal 2.

[0017] In this embodiment, side guard rings 7 extend radially in opposite directions from the outer edges of the outer walls of both floating oil seals 2. The thickness of the extended side guard rings 7 is lower than the height of the sealing ring 6. This reduces the wear on the side walls of the sealing ring 6 at the connection of the floating oil seals 2 during operation, thereby improving the service life of the sealing ring 6. The outer walls of the two side guard rings 7 are respectively matched with the inner wall of the corresponding sealing seat 13.

[0018] In this embodiment, it should be noted that the reducer assembly 11 includes a sealing seat 13, a bearing 14, a limiting ring 15, and a retaining ring 16 arranged sequentially from the outside to the inside. The bearing 14 is located inside the limiting ring 15, and the outer side wall of the bearing 14 abuts against the inner side wall of the reducer assembly 11. The retaining ring 16 is engaged with the side of the drive assembly 12 near its output end, limiting the bearing 14 and the limiting ring 15 to the inside. The retaining ring 16 improves the stability of the bearing 14 and the limiting ring 15 during internal installation. Compared with the prior art, this makes the planetary gears in the reducer assembly 11 run more stably. Both the reducer assembly 11 and the drive assembly 12 have a fixing flange 17 installed on the side of the outer side wall near the middle. Both fixing flanges 17 have mounting holes, and bolts are usually used for connection and fixation.

[0019] The zero-leakage floating oil seal assembly for concrete mixer trucks described in this utility model operates on the following principle: The assembly is installed within the main body 1 of the travel motor, which consists of a reducer assembly 11 and a drive assembly 12. Two L-shaped floating oil seals 2 are respectively embedded in the opposing sealing seats 13 of the reducer assembly 11 and the drive assembly 12. The sealing rings 6 fitted inside the floating oil seals 2 undergo elastic deformation under the pre-tightening force, providing continuous axial pressure to the sealing surfaces 3 of the two floating oil seals 2, forming the main seal. During operation, the internal lubricating oil, under pressure and centrifugal force, flows towards the radially extending trapezoidal boss 4 on the inner wall of the floating oil seal 2. The inclined surfaces 5 at both ends of the boss 4 and the V-shaped inclined surface in the middle are also present. Together, they form a flow channel, guiding the lubricating oil to the tiny gap between the two sealing surfaces 3, thereby forming a stable sealing oil film. This oil film lubricates the sealing surface 3, reducing wear, and at the same time, it enhances the sealing effect by utilizing the hydrodynamic effect, achieving zero leakage. The side guard ring 7, which extends radially from the outer edge of the floating oil seal 2, matches the inner wall of the sealing seat 13 on its outer side and is thinner than the sealing ring 6. During operation, it effectively protects the side wall of the sealing ring 6 from wear. The entire assembly is fixed by the mounting hole bolts on the fixed flange 17. The internal bearing 14 is positioned by the limit ring 15 and locked by the retaining ring 16 to ensure stable operation. When maintenance is required, the tool can be pressed against the inclined surface 5 on the other side of the boss 4 to safely push out the floating oil seal 2 for replacement.

[0020] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A zero-leakage floating oil seal assembly for a concrete mixer truck, comprising a walking motor body (1) consisting of a reducer assembly (11) and a drive assembly (12), characterized in that: The reducer assembly (11) and the drive assembly (12) are provided with sealing seats (13) on opposite sides. The two sealing seats (13) are provided with floating oil seals (2). The cross-section of the two floating oil seals (2) is L-shaped. The surface of the opposite side of the floating oil seals (2) is formed with sealing surfaces (3). The inner side wall of the two floating oil seals (2) near the sealing surfaces (3) is provided with a trapezoidal boss (4) extending radially inward. The two bosses (4) are provided with inclined surfaces (5) at both ends. The opposite side of the middle inclined surface (5) is V-shaped, which facilitates the lubricating oil to overflow between the two sealing surfaces (3) to form a sealing oil film. The inner side of the two floating oil seals (2) is provided with sealing rings (6).

2. The zero-leakage floating oil seal assembly for concrete mixer trucks according to claim 1, characterized in that: Both floating oil seals (2) have side guard rings (7) extending radially in opposite directions from their outer wall edges. The thickness of the side guard rings (7) is lower than the specified height of the sealing ring (6), which reduces the wear on the side wall of the sealing ring (6) during operation.

3. The zero-leakage floating oil seal assembly for concrete mixer trucks according to claim 2, characterized in that: The outer walls of the two side guard rings (7) are respectively matched with the inner wall of the corresponding sealing seat (13).

4. The zero-leakage floating oil seal assembly for concrete mixer trucks according to claim 1, characterized in that: The reducer assembly (11) includes a sealing seat (13), a bearing (14), a limiting ring (15), and a retaining ring (16) arranged sequentially from the outside to the inside. The bearing (14) is disposed inside the limiting ring (15), and the outer wall of the bearing (14) abuts against the inner wall of the reducer assembly (11). The retaining ring (16) is engaged on the side of the drive assembly (12) near its output end, limiting the bearing (14) and the limiting ring (15) to the inside.

5. The zero-leakage floating oil seal assembly for concrete mixer trucks according to claim 4, characterized in that: Both the reducer assembly (11) and the drive assembly (12) have a fixed flange (17) installed on the side of the outer wall near the middle, and both fixed flanges (17) have mounting holes.

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