Vehicle axle assembly structure
By introducing vents and sealing devices into the wheel and axle assembly structure of the electric counterbalance forklift, the problems of excessive internal pressure in the bearing cavity and inconvenience in grease replacement are solved, achieving protection of the sealing ring and rapid grease replacement, thus improving the protection and maintenance convenience of the reducer.
Patent Information
- Application Number
- CN202520502710.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-03-20
AI Technical Summary
During the assembly of the reducer of an electric counterbalance forklift, excessive internal pressure in the bearing cavity near the outer end and inconvenience in replacing the grease led to damage to the seals and difficulty in lubrication.
Design a vehicle wheel axle assembly structure, including a wheel axle, a sealing device, an exhaust port, a first bearing, and a second bearing. Air is discharged from the cavity through the exhaust port, and impurities are prevented from entering by the sealing device, so as to achieve rapid replacement of grease.
It effectively avoids damage to the sealing ring due to excessive internal pressure, prevents external impurities from contaminating the bearing, simplifies the maintenance and replacement process of grease, and improves the protection and maintenance efficiency of the reducer.
Smart Images
Figure CN223635285U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to vehicle wheel axle field especially relates to a vehicle wheel axle assembly structure. BACKGROUND
[0002] At present, on the electric counterbalance forklift with distributed wheel drive, a set of drive unit is configured on each front wheel, including a motor and a speed reducer. The output end of the speed reducer is generally provided with an axle, and two bearings are installed between the axle and the speed reducer shell. In the assembly process of the speed reducer, the inner and outer rings of the two bearings need to be pressed onto the axle and the speed reducer shell respectively. The bearing close to the outer end is usually lubricated with lubricating grease, and the bearing close to the inner end is usually lubricated with gear oil.
[0003] In recent years, with the increasing demand for electric forklifts, the outdoor working ability of electric forklifts has also been challenged. In order to better adapt to outdoor work, it is necessary to further improve the protection level of the speed reducer. A sealing ring is usually arranged between the axle and the outer side of the speed reducer shell to prevent external impurities and mud from entering the speed reducer and affecting the service life of the bearing. However, this design also leads to another problem, that is, when the axle and the speed reducer shell are pressed, the air in the cavity where the bearing close to the outer end is located cannot be normally discharged, resulting in excessive internal pressure and damaging the sealing ring. Moreover, due to the enhanced sealing of the speed reducer, it is difficult for after-sales personnel to quickly replace the lubricating grease. SUMMARY
[0004] The technical problem to be solved by the utility model is how to avoid excessive internal pressure in the cavity where the bearing close to the outer end is located when the axle and the speed reducer shell are pressed, and how to quickly maintain and replace the lubricating grease.
[0005] The utility model solves the above technical problems through the following technical scheme: a vehicle wheel axle assembly structure, comprising an axle, a plugging device, an exhaust hole, a speed reducer shell, a first bearing and a second bearing; the first bearing and the second bearing are sequentially arranged from the outside to the inside between the axle and the speed reducer shell, and the axle is rotatably connected with the speed reducer shell through the first bearing and the second bearing; the exhaust hole extends from the outer end of the axle to the cavity where the first bearing is located, and the plugging device plugs the outer end of the exhaust hole.
[0006] During the pressing process, the air in the cavity where the first bearing is located can be discharged through the exhaust hole, avoiding damage to the sealing ring due to excessive internal pressure. The plugging device can prevent foreign matter from entering the interior of the speed reducer through the exhaust hole, thereby polluting the working environment of the bearing and affecting the service life of the bearing. During the after-sales service process, the maintenance personnel can remove the plugging device, use a special tool to suck out the aged lubricating grease through the exhaust hole, and then inject new lubricating grease, thereby quickly and conveniently completing the replacement of the lubricating grease.
[0007] As the optimized technical scheme, the part of the cavity where the first bearing is located, which communicates with the outside, is provided with a first sealing ring. The outside impurities and mud are prevented from entering the inside of the speed reducer to pollute the working environment of the bearing and affect the working life of the bearing.
[0008] As the optimized technical scheme, the second sealing ring is arranged between the cavity where the first bearing is located and the cavity where the second bearing is located. The second sealing ring can isolate the two bearings to prevent the gear oil from leaking from the outer end of the axle.
[0009] As the optimized technical scheme, the exhaust hole is provided with an internal thread, the plugging device adopts a locking screw, and the plugging device is threadedly connected with the exhaust hole.
[0010] As the optimized technical scheme, the external thread of the plugging device and the internal thread of the exhaust hole are bonded through thread locking glue.
[0011] As the optimized technical scheme, the exhaust hole is a two-section stepped hole, the outer section is larger than the inner section in size, and the outer section is provided with an internal thread.
[0012] As the optimized technical scheme, the first bearing and the second bearing both adopt tapered roller bearings.
[0013] The advantages of the utility model lie in that: in the pressing process, the air in the cavity where the first bearing is located can be discharged through the exhaust hole, so that the sealing ring is prevented from being damaged due to excessive internal pressure; the plugging device can prevent the outside impurities from entering the inside of the speed reducer through the exhaust hole to pollute the working environment of the bearing and affect the working life of the bearing; in the after-sales service process, the maintenance personnel can remove the plugging device, use special tools to suck out the aged lubricating grease through the exhaust hole, inject new lubricating grease, and quickly and conveniently complete the replacement of the lubricating grease. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a cross-sectional schematic view of the vehicle axle assembly structure of the utility model embodiment.
[0015] Figure 2 It is an axonometric schematic view of the vehicle axle assembly structure of the utility model embodiment. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely in combination with the utility model embodiment. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the utility model embodiment, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0017] As Figure 1 , Figure 2 illustrated, the utility model discloses a vehicle wheel shaft assembly structure, including wheel shaft 1, plugging device 2, exhaust hole 3, reducer housing 4, first sealing ring 5, first bearing 6, second bearing 7 and second sealing ring 8.
[0018] Wheel shaft 1 and reducer housing 4 are sequentially provided with first bearing 6 and second bearing 7 from outside to inside, and wheel shaft 1 is rotatably connected with reducer housing 4 through first bearing 6 and second bearing 7 respectively, and first bearing 6 and second bearing 7 are both conical roller bearings.
[0019] The part of the cavity where first bearing 6 is located that communicates with the outside is provided with first sealing ring 5, so as to avoid that foreign matters and mud enter the inside of the reducer and pollute the working environment of the bearing and affect the working life of the bearing.
[0020] Second sealing ring 8 is arranged between the cavity where first bearing 6 is located and the cavity where second bearing 7 is located, first bearing 6 is lubricated by lubricating grease, second bearing 7 is lubricated by gear oil, and second sealing ring 8 can isolate the two bearings to avoid leakage of gear oil from the outer end of wheel shaft 1.
[0021] Exhaust hole 3 extends from the outer end of wheel shaft 1 to the cavity where first bearing 6 is located, and exhaust hole 3 is in two stepped shapes, the outer section of which is larger than the inner section, and the outer section is provided with internal threads; plugging device 2 plugs the outer end of exhaust hole 3, plugging device 2 adopts a set screw, is threadedly connected with exhaust hole 3, and the outer threads and the internal threads of exhaust hole 3 are adhesively bonded through thread locking glue.
[0022] Working principle: during assembly, first, first sealing ring 5, first bearing 6 and second bearing 7 are preassembled on wheel shaft 1, second sealing ring 8 is preassembled on reducer housing 4, then the preassembled wheel shaft 1 and reducer housing 4 are press-fitted through a press; during the press-fitting process, the air in the cavity where first bearing 6 is located can be discharged through exhaust hole 3, so as to avoid damage to the sealing ring due to excessive internal pressure; finally, thread locking glue is applied on the outer threads of plugging device 2, and then plugging device 2 is screwed into the outer section of exhaust hole 3, so as to avoid that foreign matters enter the inside of the reducer through exhaust hole 3 and pollute the working environment of the bearing and affect the working life of the bearing.
[0023] During the after-sales service process, the maintenance personnel can take down plugging device 2, use a special tool to suck out the aged lubricating grease through exhaust hole 3, and then inject new lubricating grease, so as to quickly and conveniently complete the replacement of the lubricating grease.
[0024] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A vehicle wheel axle assembly structure, characterized in that: The application relates to a wheel axle, a plugging device, an exhaust hole, a speed reducer shell, a first bearing and a second bearing; the first bearing and the second bearing are arranged from outside to inside between the wheel axle and the speed reducer shell, the wheel axle is rotationally connected with the speed reducer shell through the first bearing and the second bearing respectively; the exhaust hole extends from the outer end of the wheel axle to the cavity where the first bearing is located, and the plugging device plugs the outer end of the exhaust hole.
2. The vehicle axle assembly structure according to claim 1, characterized by: The part of the cavity where the first bearing is located which communicates with the outside is provided with a first sealing ring.
3. The vehicle axle assembly structure according to claim 1, characterized by: A second sealing ring is arranged between the cavity where the first bearing is located and the cavity where the second bearing is located.
4. The vehicle axle assembly structure according to claim 1, characterized by: The exhaust hole is provided with an internal thread, the plugging device adopts a set screw, and the plugging device is threadedly connected with the exhaust hole.
5. The vehicle axle assembly of claim 4, wherein: The external thread of the plugging device and the internal thread of the exhaust hole are adhered through thread locking glue.
6. The vehicle axle assembly of claim 4, wherein: The exhaust hole is a two-section stepped hole, the outer section of which is larger than the inner section, and the outer section is provided with an internal thread.
7. The vehicle axle assembly structure of claim 1, wherein: The first bearing and the second bearing are both conical roller bearings.